CSY/reowolf Changeset - cf4f87a2d85b · Centrum Wiskunde & Informatica (CWI)

Changeset - cf4f87a2d85b

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0 9 1

MH - 4 years ago 2021-05-12 20:00:59
contact@maxhenger.nl

WIP on more evaluator bugs

10 files changed with 196 insertions and 94 deletions:

src/protocol/ast.rs

src/protocol/eval/executor.rs

src/protocol/eval/store.rs

src/protocol/eval/value.rs

src/protocol/parser/pass_typing.rs

src/protocol/tests/eval_calls.rs

src/protocol/tests/eval_operators.rs

src/protocol/tests/eval_silly.rs

src/protocol/tests/mod.rs

src/protocol/tests/utils.rs

0 comments (0 inline, 0 general)

src/protocol/ast.rs

➞

Show inline comments

@@ @@ -616,48 +616,50 @@ pub enum Field { @@
     Length,
     Symbolic(FieldSymbolic),
+}
 impl Field {
     pub fn is_length(&self) -> bool {
         match self {
             Field::Length => true,
             _ => false,
+        }
+    }
     pub fn as_symbolic(&self) -> &FieldSymbolic {
         match self {
             Field::Symbolic(v) => v,
             _ => unreachable!("attempted to get Field::Symbolic from {:?}", self)
+        }
+    }
+}
 #[derive(Debug, Clone)]
 pub struct FieldSymbolic {
     // Phase 1: Parser
     pub(crate) identifier: Identifier,
     // Phase 3: Typing
     // TODO: @Monomorph These fields cannot be trusted because the last time it
     //  was typed it may refer to a different monomorph.
     pub(crate) definition: Option<DefinitionId>,
     pub(crate) field_idx: usize,
+}
 #[derive(Debug, Clone, Copy)]
 pub enum Scope {
     Definition(DefinitionId),
     Regular(BlockStatementId),
     Synchronous((SynchronousStatementId, BlockStatementId)),
+}
 impl Scope {
     pub fn is_block(&self) -> bool {
         match &self {
             Scope::Definition(_) => false,
             Scope::Regular(_) => true,
             Scope::Synchronous(_) => true,
+        }
+    }
     pub fn to_block(&self) -> BlockStatementId {
         match &self {
             Scope::Regular(id) => *id,
             Scope::Synchronous((_, id)) => *id,
             _ => panic!("unable to get BlockStatement from Scope")

src/protocol/eval/executor.rs

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Show inline comments

@@ @@ -208,130 +208,147 @@ impl Prompt { @@
         // Checking if we're at the end of execution
         let cur_frame = self.frames.last_mut().unwrap();
         if cur_frame.position.is_invalid() {
             if heap[cur_frame.definition].is_function() {
                 todo!("End of function without return, return an evaluation error");
+            }
             return Ok(EvalContinuation::Terminal);
+        }
         debug_log!("Taking step in '{}'", heap[cur_frame.definition].identifier().value.as_str());
         // Execute all pending expressions
         while !cur_frame.expr_stack.is_empty() {
             let next = cur_frame.expr_stack.pop_back().unwrap();
             debug_log!("Expr stack: {:?}", next);
             match next {
                 ExprInstruction::PushValToFront => {
                     cur_frame.expr_values.rotate_right(1);
                 },
                 ExprInstruction::EvalExpr(expr_id) => {
                     let expr = &heap[expr_id];
                     match expr {
                         Expression::Assignment(expr) => {
                             // TODO: Stuff goes wrong here, either make these
                             //  utilities do the alloc/dealloc, or let it all be
                             //  done here.
                             let to = cur_frame.expr_values.pop_back().unwrap().as_ref();
                             let rhs = cur_frame.expr_values.pop_back().unwrap();
                             // let rhs_heap_pos = rhs.get_heap_pos();
                             // Note: although not pretty, the assignment operator takes ownership
                             // of the right-hand side value when possible. So we do not drop the
                             // rhs's optionally owned heap data.
                             let rhs = self.store.read_take_ownership(rhs);
                             apply_assignment_operator(&mut self.store, to, expr.operation, rhs);
                             cur_frame.expr_values.push_back(self.store.read_copy(to));
                             // self.store.drop_value(rhs_heap_pos);
                         },
                         Expression::Binding(_expr) => {
                             todo!("Binding expression");
                         },
                         Expression::Conditional(expr) => {
                             // Evaluate testing expression, then extend the
                             // expression stack with the appropriate expression
                             let test_result = cur_frame.expr_values.pop_back().unwrap().as_bool();
                             if test_result {
                                 cur_frame.serialize_expression(heap, expr.true_expression);
                             } else {
                                 cur_frame.serialize_expression(heap, expr.false_expression);
+                            }
                         },
                         Expression::Binary(expr) => {
                             let lhs = cur_frame.expr_values.pop_back().unwrap();
                             let rhs = cur_frame.expr_values.pop_back().unwrap();
                             let result = apply_binary_operator(&mut self.store, &lhs, expr.operation, &rhs);
                             cur_frame.expr_values.push_back(result);
                             self.store.drop_value(lhs.get_heap_pos());
                             self.store.drop_value(rhs.get_heap_pos());
                         },
                         Expression::Unary(expr) => {
                             let val = cur_frame.expr_values.pop_back().unwrap();
                             let result = apply_unary_operator(&mut self.store, expr.operation, &val);
                             cur_frame.expr_values.push_back(result);
                             self.store.drop_value(val.get_heap_pos());
                         },
                         Expression::Indexing(expr) => {
                             // TODO: Out of bounds checking
                             // Evaluate index. Never heap allocated so we do
                             // not have to drop it.
                             let index = cur_frame.expr_values.pop_back().unwrap();
                             let index = self.store.maybe_read_ref(&index);
                             debug_assert!(index.is_integer());
                             let index = if index.is_signed_integer() {
                                 index.as_signed_integer() as u32
                             } else {
                                 index.as_unsigned_integer() as u32
                             };
                             // TODO: This is probably wrong, we're dropping the
                             //  heap while refering to an element...
                             let subject = cur_frame.expr_values.pop_back().unwrap();
                             let subject_heap_pos = subject.get_heap_pos();
-                            let heap_pos = match subject {
+                            let (deallocate_heap_pos, value_to_push) = match subject {
                                 Value::Ref(value_ref) => {
                                     println!("DEBUG: Called with {:?}", subject);
                                     let result = self.store.read_ref(value_ref);
                                     println!("DEBUG: And got {:?}", result);
                                     result.as_array()
                                     // Our expression stack value is a reference to something that
                                     // exists in the normal stack/heap. We don't want to deallocate
                                     // this thing. Rather we want to return a reference to it.
                                     let subject = self.store.read_ref(value_ref);
                                     let subject_heap_pos = subject.as_array();
                                     (None, Value::Ref(ValueId::Heap(subject_heap_pos, index)))
                                 },
                                 _ => {
                                     // Our value lives on the expression stack, hence we need to
                                     // clone whatever we're referring to. Then drop the subject.
                                     let subject_heap_pos = subject.as_array();
                                     let subject_indexed = Value::Ref(ValueId::Heap(subject_heap_pos, index));
                                     (Some(subject_heap_pos), self.store.clone_value(subject_indexed))
                                 },
                                 val => val.as_array(),
                             };
                             cur_frame.expr_values.push_back(Value::Ref(ValueId::Heap(heap_pos, index)));
                             self.store.drop_value(subject_heap_pos);
                             cur_frame.expr_values.push_back(value_to_push);
                             self.store.drop_value(deallocate_heap_pos);
                         },
                         Expression::Slicing(expr) => {
                             // TODO: Out of bounds checking
                             todo!("implement slicing")
                         },
                         Expression::Select(expr) => {
                             let subject= cur_frame.expr_values.pop_back().unwrap();
                             let heap_pos = match &subject {
                                 Value::Ref(value_ref) => self.store.read_ref(*value_ref).as_struct(),
                                 subject => subject.as_struct(),
                             let field_idx = expr.field.as_symbolic().field_idx as u32;
                             // Note: same as above: clone if value lives on expr stack, simply
                             // refer to it if it already lives on the stack/heap.
                             let (deallocate_heap_pos, value_to_push) = match subject {
                                 Value::Ref(value_ref) => {
                                     let subject = self.store.read_ref(value_ref);
                                     let subject_heap_pos = subject.as_struct();
                                     (None, Value::Ref(ValueId::Heap(subject_heap_pos, field_idx)))
                                 },
                                 _ => {
                                     let subject_heap_pos = subject.as_struct();
                                     let subject_indexed = Value::Ref(ValueId::Heap(subject_heap_pos, field_idx));
                                     (Some(subject_heap_pos), self.store.clone_value(subject_indexed))
                                 },
                             };
                             cur_frame.expr_values.push_back(Value::Ref(ValueId::Heap(heap_pos, expr.field.as_symbolic().field_idx as u32)));
                             self.store.drop_value(subject.get_heap_pos());
                             cur_frame.expr_values.push_back(value_to_push);
                             self.store.drop_value(deallocate_heap_pos);
                         },
                         Expression::Literal(expr) => {
                             let value = match &expr.value {
                                 Literal::Null => Value::Null,
                                 Literal::True => Value::Bool(true),
                                 Literal::False => Value::Bool(false),
                                 Literal::Character(lit_value) => Value::Char(*lit_value),
                                 Literal::String(lit_value) => {
                                     let heap_pos = self.store.alloc_heap();
                                     let values = &mut self.store.heap_regions[heap_pos as usize].values;
                                     let value = lit_value.as_str();
                                     debug_assert!(values.is_empty());
                                     values.reserve(value.len());
                                     for character in value.as_bytes() {
                                         debug_assert!(character.is_ascii());
                                         values.push(Value::Char(*character as char));
+                                    }
                                     Value::String(heap_pos)
+                                }
                                 Literal::Integer(lit_value) => {
                                     use ConcreteTypePart as CTP;
                                     debug_assert_eq!(expr.concrete_type.parts.len(), 1);
                                     match expr.concrete_type.parts[0] {
                                         CTP::UInt8  => Value::UInt8(lit_value.unsigned_value as u8),
@@ @@ -503,124 +520,131 @@ impl Prompt { @@
             Statement::Continue(stmt) => {
                 cur_frame.position = stmt.target.unwrap().upcast();
                 Ok(EvalContinuation::Stepping)
             },
             Statement::Synchronous(stmt) => {
                 cur_frame.position = stmt.body.upcast();
                 Ok(EvalContinuation::SyncBlockStart)
             },
             Statement::EndSynchronous(stmt) => {
                 cur_frame.position = stmt.next;
                 Ok(EvalContinuation::SyncBlockEnd)
             },
             Statement::Return(stmt) => {
                 debug_assert!(heap[cur_frame.definition].is_function());
                 debug_assert_eq!(cur_frame.expr_values.len(), 1, "expected one expr value for return statement");
                 // The preceding frame has executed a call, so is expecting the
                 // return expression on its expression value stack. Note that
                 // we may be returning a reference to something on our stack,
                 // so we need to read that value and clone it.
                 let return_value = cur_frame.expr_values.pop_back().unwrap();
                 println!("DEBUG: Pre-ret val {:?}", &return_value);
                 let return_value = match return_value {
                     Value::Ref(value_id) => self.store.read_copy(value_id),
                     _ => return_value,
                 };
                 println!("DEBUG: Pos-ret val {:?}", &return_value);
                 // Pre-emptively pop our stack frame
                 self.frames.pop();
                 // Clean up our section of the stack
                 self.store.clear_stack(0);
                 let prev_stack_idx = self.store.stack.pop().unwrap().as_stack_boundary();
                 // TODO: Temporary hack for testing, remove at some point
                 if self.frames.is_empty() {
                     debug_assert!(prev_stack_idx == -1);
                     debug_assert!(self.store.stack.len() == 0);
                     self.store.stack.push(return_value);
                     return Ok(EvalContinuation::Terminal);
+                }
                 debug_assert!(prev_stack_idx >= 0);
                 // Return to original state of stack frame
                 self.store.cur_stack_boundary = prev_stack_idx as usize;
                 let cur_frame = self.frames.last_mut().unwrap();
                 cur_frame.expr_values.push_back(return_value);
                 // Immediately return, we don't care about the current frame
                 // anymore and there is nothing left to evaluate
                 // We just returned to the previous frame, which might be in
                 // the middle of evaluating expressions for a particular
                 // statement. So we don't want to enter the code below.
                 return Ok(EvalContinuation::Stepping);
             },
             Statement::Goto(stmt) => {
                 cur_frame.position = stmt.target.unwrap().upcast();
                 Ok(EvalContinuation::Stepping)
             },
             Statement::New(stmt) => {
                 let call_expr = &heap[stmt.expression];
                 debug_assert!(heap[call_expr.definition].is_component());
                 debug_assert_eq!(
                     cur_frame.expr_values.len(), heap[call_expr.definition].parameters().len(),
                     "mismatch in expr stack size and number of arguments for new statement"
                 );
                 // Note that due to expression value evaluation they exist in
                 // reverse order on the stack.
                 // TODO: Revise this code, keep it as is to be compatible with current runtime
                 let mut args = Vec::new();
                 while let Some(value) = cur_frame.expr_values.pop_front() {
                     args.push(value);
+                }
                 // Construct argument group, thereby copying heap regions
                 let argument_group = ValueGroup::from_store(&self.store, &args);
                 // Clear any heap regions
                 for arg in &args {
                     self.store.drop_value(arg.get_heap_pos());
+                }
                 cur_frame.position = stmt.next;
                 todo!("Make sure this is handled correctly, transfer 'heap' values to another Prompt");
                 Ok(EvalContinuation::NewComponent(call_expr.definition, argument_group))
             },
             Statement::Expression(stmt) => {
                 // The expression has just been completely evaluated. Some
                 // values might have remained on the expression value stack.
                 cur_frame.expr_values.clear();
                 cur_frame.position = stmt.next;
                 Ok(EvalContinuation::Stepping)
             },
         };
         assert!(
             cur_frame.expr_values.is_empty(),
             "This is a debugging assertion that will fail if you perform expressions without \
             assigning to anything. This should be completely valid, and this assertions should be \
             replaced by something that clears the expression values if needed, but I'll keep this \
             in for now for debugging purposes."
         );
         // If the next statement requires evaluating expressions then we push
         // these onto the expression stack. This way we will evaluate this
         // stack in the next loop, then evaluate the statement using the result
         // from the expression evaluation.
         if !cur_frame.position.is_invalid() {
             let stmt = &heap[cur_frame.position];
             match stmt {
                 Statement::If(stmt) => cur_frame.prepare_single_expression(heap, stmt.test),
                 Statement::While(stmt) => cur_frame.prepare_single_expression(heap, stmt.test),
                 Statement::Return(stmt) => {
                     debug_assert_eq!(stmt.expressions.len(), 1); // TODO: @ReturnValues
                     cur_frame.prepare_single_expression(heap, stmt.expressions[0]);
                 },
                 Statement::New(stmt) => {
                     // Note that we will end up not evaluating the call itself.
                     // Rather we will evaluate its expressions and then
                     // instantiate the component upon reaching the "new" stmt.
                     let call_expr = &heap[stmt.expression];
                     cur_frame.prepare_multiple_expressions(heap, &call_expr.arguments);
                 },
                 Statement::Expression(stmt) => {
                     cur_frame.prepare_single_expression(heap, stmt.expression);
+                }

src/protocol/eval/store.rs

➞

Show inline comments

@@ @@ -127,52 +127,51 @@ impl Store { @@
+        }
+    }
     /// Writes a value
     pub(crate) fn write(&mut self, address: ValueId, value: Value) {
         match address {
             ValueId::Stack(pos) => {
                 let cur_pos = self.cur_stack_boundary + 1 + pos as usize;
                 self.drop_value(self.stack[cur_pos].get_heap_pos());
                 self.stack[cur_pos] = value;
             },
             ValueId::Heap(heap_pos, region_idx) => {
                 let heap_pos = heap_pos as usize;
                 let region_idx = region_idx as usize;
                 self.drop_value(self.heap_regions[heap_pos].values[region_idx].get_heap_pos());
                 self.heap_regions[heap_pos].values[region_idx] = value
+            }
+        }
+    }
     /// This thing takes a cloned Value, because of borrowing issues (which is
     /// either a direct value, or might contain an index to a heap value), but
     /// should be treated by the programmer as a reference (i.e. don't call
     /// `drop_value(thing)` after calling `clone_value(thing.clone())`.
     fn clone_value(&mut self, value: Value) -> Value {
+    pub(crate) fn clone_value(&mut self, value: Value) -> Value {
         // Quickly check if the value is not on the heap
         let source_heap_pos = value.get_heap_pos();
         println!("DEBUG: Cloning {:?}", value);
         if source_heap_pos.is_none() {
             // We can do a trivial copy, unless we're dealing with a value
             // reference
             return match value {
                 Value::Ref(ValueId::Stack(stack_pos)) => {
                     let abs_stack_pos = self.cur_stack_boundary + stack_pos as usize + 1;
                     self.clone_value(self.stack[abs_stack_pos].clone())
                 },
                 Value::Ref(ValueId::Heap(heap_pos, val_idx)) => {
                     self.clone_value(self.heap_regions[heap_pos as usize].values[val_idx as usize].clone())
                 },
                 _ => value,
             };
+        }
         // Value does live on heap, copy it
         let source_heap_pos = source_heap_pos.unwrap() as usize;
         let target_heap_pos = self.alloc_heap();
         let target_heap_pos_usize = target_heap_pos as usize;
         let num_values = self.heap_regions[source_heap_pos].values.len();
         for value_idx in 0..num_values {
             let cloned = self.clone_value(self.heap_regions[source_heap_pos].values[value_idx].clone());
             self.heap_regions[target_heap_pos_usize].values.push(cloned);

src/protocol/eval/value.rs

➞

Show inline comments

@@ @@ -254,48 +254,49 @@ impl Default for ValueGroup { @@
     fn default() -> Self {
         Self { values: Vec::new(), regions: Vec::new() }
+    }
+}
 pub(crate) fn apply_assignment_operator(store: &mut Store, lhs: ValueId, op: AssignmentOperator, rhs: Value) {
     use AssignmentOperator as AO;
     macro_rules! apply_int_op {
         ($lhs:ident, $assignment_tokens:tt, $operator:ident, $rhs:ident) => {
             match $lhs {
                 Value::UInt8(v)  => { *v $assignment_tokens $rhs.as_uint8();  },
                 Value::UInt16(v) => { *v $assignment_tokens $rhs.as_uint16(); },
                 Value::UInt32(v) => { *v $assignment_tokens $rhs.as_uint32(); },
                 Value::UInt64(v) => { *v $assignment_tokens $rhs.as_uint64(); },
                 Value::SInt8(v)  => { *v $assignment_tokens $rhs.as_sint8();  },
                 Value::SInt16(v) => { *v $assignment_tokens $rhs.as_sint16(); },
                 Value::SInt32(v) => { *v $assignment_tokens $rhs.as_sint32(); },
                 Value::SInt64(v) => { *v $assignment_tokens $rhs.as_sint64(); },
                 _ => unreachable!("apply_assignment_operator {:?} on lhs {:?} and rhs {:?}", $operator, $lhs, $rhs),
+            }
+        }
+    }
     // let rhs = store.maybe_read_ref(&rhs).clone(); // we don't own this thing, so don't drop it
     let lhs = store.read_mut_ref(lhs);
     let mut to_dealloc = None;
     match op {
         AO::Set => {
             match lhs {
                 Value::Unassigned => { *lhs = rhs; },
                 Value::Input(v)  => { *v = rhs.as_input(); },
                 Value::Output(v) => { *v = rhs.as_output(); },
                 Value::Message(v)  => { to_dealloc = Some(*v); *v = rhs.as_message(); },
                 Value::Bool(v)    => { *v = rhs.as_bool(); },
                 Value::Char(v) => { *v = rhs.as_char(); },
                 Value::String(v) => { *v = rhs.as_string().clone(); },
                 Value::UInt8(v) => { *v = rhs.as_uint8(); },
                 Value::UInt16(v) => { *v = rhs.as_uint16(); },
                 Value::UInt32(v) => { *v = rhs.as_uint32(); },
                 Value::UInt64(v) => { *v = rhs.as_uint64(); },
                 Value::SInt8(v) => { *v = rhs.as_sint8(); },
                 Value::SInt16(v) => { *v = rhs.as_sint16(); },
                 Value::SInt32(v) => { *v = rhs.as_sint32(); },
                 Value::SInt64(v) => { *v = rhs.as_sint64(); },
                 Value::Array(v) => { to_dealloc = Some(*v); *v = rhs.as_array(); },
                 Value::Enum(v) => { *v = rhs.as_enum(); },
                 Value::Union(lhs_tag, lhs_heap_pos) => {
         let rhs = store.maybe_read_ref(rhs);
         enum ValueKind { Message, String, Array };
         let value_kind;
         match lhs {
             Value::Message(lhs_pos) => {
                 lhs_heap_pos = *lhs_pos;
                 rhs_heap_pos = rhs.as_message();
                 value_kind = ValueKind::Message;
             },
             Value::String(lhs_pos) => {
                 lhs_heap_pos = *lhs_pos;
                 rhs_heap_pos = rhs.as_string();
                 value_kind = ValueKind::String;
             },
             Value::Array(lhs_pos) => {
                 lhs_heap_pos = *lhs_pos;
                 rhs_heap_pos = rhs.as_array();
                 value_kind = ValueKind::Array;
             },
             _ => unreachable!("apply_binary_operator {:?} on lhs {:?} and rhs {:?}", op, lhs, rhs)
+        }
         let lhs_heap_pos = lhs_heap_pos as usize;
         let rhs_heap_pos = rhs_heap_pos as usize;
         // TODO: I hate this, but fine...
         let mut concatenated = Vec::new();
         concatenated.extend_from_slice(&store.heap_regions[lhs_heap_pos as usize].values);
         concatenated.extend_from_slice(&store.heap_regions[rhs_heap_pos as usize].values);
         let lhs_len = store.heap_regions[lhs_heap_pos].values.len();
         let rhs_len = store.heap_regions[rhs_heap_pos].values.len();
         concatenated.reserve(lhs_len + rhs_len);
         for idx in 0..lhs_len {
             concatenated.push(store.clone_value(store.heap_regions[lhs_heap_pos].values[idx].clone()));
+        }
         for idx in 0..rhs_len {
             concatenated.push(store.clone_value(store.heap_regions[rhs_heap_pos].values[idx].clone()));
+        }
         store.heap_regions[target_heap_pos as usize].values = concatenated;
         return match value_kind{
             ValueKind::Message => Value::Message(target_heap_pos),
             ValueKind::String => Value::String(target_heap_pos),
             ValueKind::Array => Value::Array(target_heap_pos),
         };
+    }
     // If any of the values are references, retrieve the thing they're referring
     // to.
     let lhs = store.maybe_read_ref(lhs);
     let rhs = store.maybe_read_ref(rhs);
     match op {
         BO::Concatenate => unreachable!(),
         BO::LogicalOr => {
             return Value::Bool(lhs.as_bool() || rhs.as_bool());
         },
         BO::LogicalAnd => {
             return Value::Bool(lhs.as_bool() && rhs.as_bool());
         },
         BO::BitwiseOr        => { apply_int_op_and_return_self!(lhs, |,  op, rhs); },

src/protocol/parser/pass_typing.rs

➞

Show inline comments

@@ @@ -49,48 +49,49 @@ macro_rules! debug_log { @@
     ($format:literal) => {
         enabled_debug_print!(false, "types", $format);
     };
     ($format:literal, $($args:expr),*) => {
         enabled_debug_print!(false, "types", $format, $($args),*);
     };
+}
 use std::collections::{HashMap, HashSet};
 use crate::protocol::ast::*;
 use crate::protocol::input_source::ParseError;
 use crate::protocol::parser::ModuleCompilationPhase;
 use crate::protocol::parser::type_table::*;
 use crate::protocol::parser::token_parsing::*;
 use super::visitor::{
     STMT_BUFFER_INIT_CAPACITY,
     EXPR_BUFFER_INIT_CAPACITY,
     Ctx,
     Visitor2,
     VisitorResult
 };
 use std::collections::hash_map::Entry;
 const VOID_TEMPLATE: [InferenceTypePart; 1] = [ InferenceTypePart::Void ];
 const MESSAGE_TEMPLATE: [InferenceTypePart; 2] = [ InferenceTypePart::Message, InferenceTypePart::UInt8 ];
 const BOOL_TEMPLATE: [InferenceTypePart; 1] = [ InferenceTypePart::Bool ];
 const CHARACTER_TEMPLATE: [InferenceTypePart; 1] = [ InferenceTypePart::Character ];
 const STRING_TEMPLATE: [InferenceTypePart; 1] = [ InferenceTypePart::String ];
 const NUMBERLIKE_TEMPLATE: [InferenceTypePart; 1] = [ InferenceTypePart::NumberLike ];
 const INTEGERLIKE_TEMPLATE: [InferenceTypePart; 1] = [ InferenceTypePart::IntegerLike ];
 const ARRAY_TEMPLATE: [InferenceTypePart; 2] = [ InferenceTypePart::Array, InferenceTypePart::Unknown ];
 const ARRAYLIKE_TEMPLATE: [InferenceTypePart; 2] = [ InferenceTypePart::ArrayLike, InferenceTypePart::Unknown ];
 /// TODO: @performance Turn into PartialOrd+Ord to simplify checks
 /// TODO: @types Remove the Message -> Byte hack at some point...
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub(crate) enum InferenceTypePart {
     // A marker with an identifier which we can use to retrieve the type subtree
     // that follows the marker. This is used to perform type inference on
     // polymorphs: an expression may determine the polymorphs type, after we
     // need to apply that information to all other places where the polymorph is
     // used.
     MarkerDefinition(usize), // marker for polymorph types on a procedure's definition
     MarkerBody(usize), // marker for polymorph types within a procedure body
     // Completely unknown type, needs to be inferred
     Unknown,
     // Partially known type, may be inferred to to be the appropriate related
     // type.
@@ @@ -1189,48 +1190,55 @@ impl Visitor2 for PassTyping { @@
         self.visit_expr(ctx, subject_expr_id)?;
         self.visit_expr(ctx, index_expr_id)?;
         self.progress_indexing_expr(ctx, id)
+    }
     fn visit_slicing_expr(&mut self, ctx: &mut Ctx, id: SlicingExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         self.insert_initial_expr_inference_type(ctx, upcast_id)?;
         let slicing_expr = &ctx.heap[id];
         let subject_expr_id = slicing_expr.subject;
         let from_expr_id = slicing_expr.from_index;
         let to_expr_id = slicing_expr.to_index;
         self.visit_expr(ctx, subject_expr_id)?;
         self.visit_expr(ctx, from_expr_id)?;
         self.visit_expr(ctx, to_expr_id)?;
         self.progress_slicing_expr(ctx, id)
+    }
     fn visit_select_expr(&mut self, ctx: &mut Ctx, id: SelectExpressionId) -> VisitorResult {
         // TODO: @Monomorph, this is a temporary hack, see other comments
         let expr = &mut ctx.heap[id];
         if let Field::Symbolic(field) = &mut expr.field {
             field.definition = None;
             field.field_idx = 0;
+        }
         let upcast_id = id.upcast();
         self.insert_initial_expr_inference_type(ctx, upcast_id)?;
         let select_expr = &ctx.heap[id];
         let subject_expr_id = select_expr.subject;
         self.visit_expr(ctx, subject_expr_id)?;
         self.progress_select_expr(ctx, id)
+    }
     fn visit_literal_expr(&mut self, ctx: &mut Ctx, id: LiteralExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         self.insert_initial_expr_inference_type(ctx, upcast_id)?;
         let literal_expr = &ctx.heap[id];
         match &literal_expr.value {
             Literal::Null | Literal::False | Literal::True |
             Literal::Integer(_) | Literal::Character(_) | Literal::String(_) => {
                 // No subexpressions
             },
             Literal::Struct(literal) => {
                 // TODO: @performance
                 let expr_ids: Vec<_> = literal.fields
@@ @@ -1326,48 +1334,51 @@ macro_rules! debug_assert_ptrs_distinct { @@
     ($ptr1:ident, $ptr2:ident) => {
         debug_assert!(!std::ptr::eq($ptr1, $ptr2));
     };
     // Generic case
     ($ptr1:ident, $ptr2:ident, $($tail:ident),+) => {
         debug_assert_ptrs_distinct!($ptr1, $ptr2);
         debug_assert_ptrs_distinct!($ptr2, $($tail),+);
     };
+}
 impl PassTyping {
     fn resolve_types(&mut self, ctx: &mut Ctx, queue: &mut ResolveQueue) -> Result<(), ParseError> {
         // Keep inferring until we can no longer make any progress
         while let Some(next_expr_id) = self.expr_queued.iter().next() {
             let next_expr_id = *next_expr_id;
             self.expr_queued.remove(&next_expr_id);
             self.progress_expr(ctx, next_expr_id)?;
+        }
         // We check if we have all the types we need. If we're typechecking a
         // polymorphic procedure more than once, then we have already annotated
         // the AST and have now performed typechecking for a different
         // monomorph. In that case we just need to perform typechecking, no need
         // to annotate the AST again.
         // TODO: @Monomorph, this is completely wrong. It seemed okay, but it
         //  isn't. Each monomorph might result in completely different internal
         //  types.
         let definition_id = match &self.definition_type {
             DefinitionType::Component(id) => id.upcast(),
             DefinitionType::Function(id) => id.upcast(),
         };
         let already_checked = ctx.types.get_base_definition(&definition_id).unwrap().has_any_monomorph();
         for (expr_id, expr_type) in self.expr_types.iter_mut() {
             if !expr_type.is_done {
                 // Auto-infer numberlike/integerlike types to a regular int
                 if expr_type.parts.len() == 1 && expr_type.parts[0] == InferenceTypePart::IntegerLike {
                     expr_type.parts[0] = InferenceTypePart::SInt32;
                 } else {
                     let expr = &ctx.heap[*expr_id];
                     return Err(ParseError::new_error_at_span(
                         &ctx.module.source, expr.span(), format!(
                             "could not fully infer the type of this expression (got '{}')",
                             expr_type.display_name(&ctx.heap)
+                        )
                     ));
+                }
+            }
             if !already_checked {
                 let concrete_type = ctx.heap[*expr_id].get_type_mut();
@@ @@ -1496,82 +1507,87 @@ impl PassTyping { @@
                 self.progress_slicing_expr(ctx, id)
             },
             Expression::Select(expr) => {
                 let id = expr.this;
                 self.progress_select_expr(ctx, id)
             },
             Expression::Literal(expr) => {
                 let id = expr.this;
                 self.progress_literal_expr(ctx, id)
             },
             Expression::Call(expr) => {
                 let id = expr.this;
                 self.progress_call_expr(ctx, id)
             },
             Expression::Variable(expr) => {
                 let id = expr.this;
                 self.progress_variable_expr(ctx, id)
+            }
+        }
+    }
     fn progress_assignment_expr(&mut self, ctx: &mut Ctx, id: AssignmentExpressionId) -> Result<(), ParseError> {
         use AssignmentOperator as AO;
         // TODO: Assignable check
         let upcast_id = id.upcast();
         // Assignment does not return anything (it operates like a statement)
         let progress_expr = self.apply_forced_constraint(ctx, upcast_id, &VOID_TEMPLATE)?;
         let expr = &ctx.heap[id];
         let arg1_expr_id = expr.left;
         let arg2_expr_id = expr.right;
         debug_log!("Assignment expr '{:?}': {}", expr.operation, upcast_id.index);
         debug_log!(" * Before:");
         debug_log!("   - Arg1 type: {}", self.expr_types.get(&arg1_expr_id).unwrap().display_name(&ctx.heap));
         debug_log!("   - Arg2 type: {}", self.expr_types.get(&arg2_expr_id).unwrap().display_name(&ctx.heap));
         debug_log!("   - Expr type: {}", self.expr_types.get(&upcast_id).unwrap().display_name(&ctx.heap));
         let progress_base = match expr.operation {
         // Apply forced constraint to LHS value
         let progress_forced = match expr.operation {
             AO::Set =>
                 false,
             AO::Multiplied | AO::Divided | AO::Added | AO::Subtracted =>
-                self.apply_forced_constraint(ctx, upcast_id, &NUMBERLIKE_TEMPLATE)?,
+                self.apply_forced_constraint(ctx, arg1_expr_id, &NUMBERLIKE_TEMPLATE)?,
             AO::Remained | AO::ShiftedLeft | AO::ShiftedRight |
             AO::BitwiseAnded | AO::BitwiseXored | AO::BitwiseOred =>
-                self.apply_forced_constraint(ctx, upcast_id, &INTEGERLIKE_TEMPLATE)?,
+                self.apply_forced_constraint(ctx, arg1_expr_id, &INTEGERLIKE_TEMPLATE)?,
         };
         let (progress_expr, progress_arg1, progress_arg2) = self.apply_equal3_constraint(
             ctx, upcast_id, arg1_expr_id, arg2_expr_id, 0
         let (progress_arg1, progress_arg2) = self.apply_equal2_constraint(
             ctx, upcast_id, arg1_expr_id, 0, arg2_expr_id, 0
         )?;
         debug_assert!(if progress_forced { progress_arg2 } else { true });
         debug_log!(" * After:");
         debug_log!("   - Arg1 type [{}]: {}", progress_arg1, self.expr_types.get(&arg1_expr_id).unwrap().display_name(&ctx.heap));
+        debug_log!("   - Arg1 type [{}]: {}", progress_forced || progress_arg1, self.expr_types.get(&arg1_expr_id).unwrap().display_name(&ctx.heap));
         debug_log!("   - Arg2 type [{}]: {}", progress_arg2, self.expr_types.get(&arg2_expr_id).unwrap().display_name(&ctx.heap));
-        debug_log!("   - Expr type [{}]: {}", progress_base || progress_expr, self.expr_types.get(&upcast_id).unwrap().display_name(&ctx.heap));
         debug_log!("   - Expr type [{}]: {}", progress_expr, self.expr_types.get(&upcast_id).unwrap().display_name(&ctx.heap));
         if progress_base || progress_expr { self.queue_expr_parent(ctx, upcast_id); }
         if progress_arg1 { self.queue_expr(arg1_expr_id); }
         if progress_expr { self.queue_expr_parent(ctx, upcast_id); }
         if progress_forced || progress_arg1 { self.queue_expr(arg1_expr_id); }
         if progress_arg2 { self.queue_expr(arg2_expr_id); }
         Ok(())
+    }
     fn progress_conditional_expr(&mut self, ctx: &mut Ctx, id: ConditionalExpressionId) -> Result<(), ParseError> {
         // Note: test expression type is already enforced
         let upcast_id = id.upcast();
         let expr = &ctx.heap[id];
         let arg1_expr_id = expr.true_expression;
         let arg2_expr_id = expr.false_expression;
         debug_log!("Conditional expr: {}", upcast_id.index);
         debug_log!(" * Before:");
         debug_log!("   - Arg1 type: {}", self.expr_types.get(&arg1_expr_id).unwrap().display_name(&ctx.heap));
         debug_log!("   - Arg2 type: {}", self.expr_types.get(&arg2_expr_id).unwrap().display_name(&ctx.heap));
         debug_log!("   - Expr type: {}", self.expr_types.get(&upcast_id).unwrap().display_name(&ctx.heap));
         let (progress_expr, progress_arg1, progress_arg2) = self.apply_equal3_constraint(
             ctx, upcast_id, arg1_expr_id, arg2_expr_id, 0
         )?;
         debug_log!(" * After:");
         debug_log!("   - Arg1 type [{}]: {}", progress_arg1, self.expr_types.get(&arg1_expr_id).unwrap().display_name(&ctx.heap));
@@ @@ -2337,49 +2353,49 @@ impl PassTyping { @@
         let progress_ret = Self::apply_equal2_polyvar_constraint(
             extra, &poly_progress, signature_type, ret_type
         );
         debug_log!(
             "   - Ret type | sig: {}, arg: {}",
             unsafe{&*signature_type}.display_name(&ctx.heap),
             unsafe{&*ret_type}.display_name(&ctx.heap)
         );
         if progress_ret {
             self.queue_expr_parent(ctx, upcast_id);
+        }
         debug_log!(" * After:");
         debug_log!("   - Expr type: {}", self.expr_types.get(&upcast_id).unwrap().display_name(&ctx.heap));
         Ok(())
+    }
     fn progress_variable_expr(&mut self, ctx: &mut Ctx, id: VariableExpressionId) -> Result<(), ParseError> {
         let upcast_id = id.upcast();
         let var_expr = &ctx.heap[id];
         let var_id = var_expr.declaration.unwrap();
-        debug_log!("Variable expr '{}': {}", ctx.heap[var_id].identifier().value.as_str(), upcast_id.index);
         debug_log!("Variable expr '{}': {}", ctx.heap[var_id].identifier.value.as_str(), upcast_id.index);
         debug_log!(" * Before:");
         debug_log!("   - Var  type: {}", self.var_types.get(&var_id).unwrap().var_type.display_name(&ctx.heap));
         debug_log!("   - Expr type: {}", self.expr_types.get(&upcast_id).unwrap().display_name(&ctx.heap));
         // Retrieve shared variable type and expression type and apply inference
         let var_data = self.var_types.get_mut(&var_id).unwrap();
         let expr_type = self.expr_types.get_mut(&upcast_id).unwrap();
         let infer_res = unsafe{ InferenceType::infer_subtrees_for_both_types(
             &mut var_data.var_type as *mut _, 0, expr_type, 0
         ) };
         if infer_res == DualInferenceResult::Incompatible {
             let var_decl = &ctx.heap[var_id];
             return Err(ParseError::new_error_at_span(
                 &ctx.module.source, var_decl.identifier.span, format!(
                     "Conflicting types for this variable, previously assigned the type '{}'",
                     var_data.var_type.display_name(&ctx.heap)
+                )
             ).with_info_at_span(
                 &ctx.module.source, var_expr.identifier.span, format!(
                     "But inferred to have incompatible type '{}' here",
                     expr_type.display_name(&ctx.heap)
+                )
             ))
@@ @@ -2598,49 +2614,48 @@ impl PassTyping { @@
     /// `apply_equal2_signature_constraint`. As such, we expect to not encounter
     /// any errors.
     ///
     /// This function returns true if the expression's type has been progressed
     fn apply_equal2_polyvar_constraint(
         polymorph_data: &ExtraData, _polymorph_progress: &HashSet<usize>,
         signature_type: *mut InferenceType, expr_type: *mut InferenceType
     ) -> bool {
         // Safety: all pointers should be distinct
         //         polymorph_data contains may not be modified
         debug_assert_ptrs_distinct!(signature_type, expr_type);
         let signature_type = unsafe{&mut *signature_type};
         let expr_type = unsafe{&mut *expr_type};
         // Iterate through markers in signature type to try and make progress
         // on the polymorphic variable
         let mut seek_idx = 0;
         let mut modified_sig = false;
         while let Some((poly_idx, start_idx)) = signature_type.find_body_marker(seek_idx) {
             let end_idx = InferenceType::find_subtree_end_idx(&signature_type.parts, start_idx);
             // if polymorph_progress.contains(&poly_idx) {
                 // Need to match subtrees
                 let polymorph_type = &polymorph_data.poly_vars[poly_idx];
                 debug_log!("   - DEBUG: Applying {} to '{}' from '{}'", polymorph_type.display_name(heap), InferenceType::partial_display_name(heap, &signature_type.parts[start_idx..]), signature_type.display_name(heap));
                 let modified_at_marker = Self::apply_forced_constraint_types(
                     signature_type, start_idx,
                     &polymorph_type.parts, 0
                 ).expect("no failure when applying polyvar constraints");
                 modified_sig = modified_sig || modified_at_marker;
             // }
             seek_idx = end_idx;
+        }
         // If we made any progress on the signature's type, then we also need to
         // apply it to the expression that is supposed to match the signature.
         if modified_sig {
             match InferenceType::infer_subtree_for_single_type(
                 expr_type, 0, &signature_type.parts, 0
             ) {
                 SingleInferenceResult::Modified => true,
                 SingleInferenceResult::Unmodified => false,
                 SingleInferenceResult::Incompatible =>
                     unreachable!("encountered failure while reapplying modified signature to expression after polyvar inference")
+            }
         } else {
             false

src/protocol/tests/eval_calls.rs

➞

Show inline comments

 use super::*;
 use crate::protocol::eval::*;
 #[test]
 fn test_function_call() {
     Tester::new_single_source_expect_ok("with literal arg", "
     func add_two(u32 value) -> u32 {
         return value + 2;
+    }
     func foo() -> u32 {
         return add_two(5);
+    }
     ").for_function("foo", |f| {
         f.call(Some(Value::UInt32(7)));
     });
     println!("\n\n\n\n\n\n\n");
     Tester::new_single_source_expect_ok("with variable arg", "
     func add_two(u32 value) -> u32 {
         value += 1;
         return value + 1;
+    }
     func foo() -> bool {
         auto initial = 5;
         auto result = add_two(initial);

src/protocol/tests/eval_operators.rs

➞

Show inline comments

 use super::*;
 use crate::protocol::eval::*;
 #[test]
 fn test_assignment_operators() {
     fn construct_source(value_type: &str, value_initial: &str, value_op: &str) -> String {
         return format!(
             "func foo() -> {} {{
                 {} value = {};
                 value {};
                 return value;
             }}",
             value_type, value_type, value_initial, value_op
         );
+    }
     fn perform_test(name: &str, source: String, expected_value: Value) {
         Tester::new_single_source_expect_ok(name, source)
             .for_function("foo", move |f| {
                 f.call(Some(expected_value));
             });
+    }
     perform_test(
         "set",
         construct_source("u32", "1", "= 5"),
@@ @@ -67,96 +66,48 @@ fn test_assignment_operators() { @@
         "shifted right",
         construct_source("u32", "8", ">>= 2"),
         Value::UInt32(2)
     );
     perform_test(
         "bitwise and",
         construct_source("u32", "15", "&= 35"),
         Value::UInt32(3)
     );
     perform_test(
         "bitwise xor",
         construct_source("u32", "3", "^= 7"),
         Value::UInt32(4)
     );
     perform_test(
         "bitwise or",
         construct_source("u32", "12", "|= 3"),
         Value::UInt32(15)
     );
+}
 #[test]
 fn test_concatenate_operator() {
     Tester::new_single_source_expect_ok(
         "concatenate and check pairs",
+        "
         func check_pair<T>(T[] arr, u32 idx) -> bool {
             return arr[idx] == arr[idx + 1];
+        }
         struct Point2D {
             u32 x,
             u32 y,
+        }
         func create_point(u32 x, u32 y) -> Point2D {
             return Point2D{ x: x, y: y };
+        }
         func create_array() -> Point2D[] {
             return {
                 create_point(1, 2),
                 create_point(1, 2),
                 create_point(3, 4),
                 create_point(3, 4)
             };
+        }
         func foo() -> bool {
             auto lhs = create_array();
             auto rhs = create_array();
             auto total = lhs @ rhs;
             auto is_equal =
                 check_pair(total, 0) &&
                 check_pair(total, 2) &&
                 check_pair(total, 4) &&
                 check_pair(total, 6);
             auto is_not_equal =
                 !check_pair(total, 0) ||
                 !check_pair(total, 2) ||
                 !check_pair(total, 4) ||
                 !check_pair(total, 6);
             return is_equal && !is_not_equal;
+        }
+        "
     ).for_function("foo", |f| {
         f.call(Some(Value::Bool(true)));
     });
+}
 #[test]
 fn test_binary_integer_operators() {
     fn construct_source(value_type: &str, code: &str) -> String {
         format!("
         func foo() -> {} {{
             {}
         }}
         ", value_type, code)
+    }
     fn perform_test(test_name: &str, value_type: &str, code: &str, expected_value: Value) {
         Tester::new_single_source_expect_ok(test_name, construct_source(value_type, code))
             .for_function("foo", move |f| {
                 f.call(Some(expected_value));
             });
+    }
     perform_test(
         "bitwise_or", "u16",
         "auto a = 3; return a | 4;", Value::UInt16(7)
     );
     perform_test(
         "bitwise_xor", "u16",
         "auto a = 3; return a ^ 7;", Value::UInt16(4)

src/protocol/tests/eval_silly.rs

➞

Show inline comments

@@ new file 100644 @@
 use super::*;
 #[test]
 fn test_concatenate_operator() {
     Tester::new_single_source_expect_ok(
         "concatenate and check values",
+        "
         // Too see if we accept the polymorphic arg
         func check_pair<T>(T[] arr, u32 idx) -> bool {
             return arr[idx] == arr[idx + 1];
+        }
         // Too see if we can check fields of polymorphs
         func check_values<T>(T[] arr, u32 idx, u32 x, u32 y) -> bool {
             auto value = arr[idx];
             return value.x == x && value.y == y;
+        }
         struct Point2D {
             u32 x,
             u32 y,
+        }
         // Could do this inline, but we're attempt to stress the system a bit
         func create_point(u32 x, u32 y) -> Point2D {
             return Point2D{ x: x, y: y };
+        }
         // Again, more stressing: returning a heap-allocated thing
         func create_array() -> Point2D[] {
             return {
                 create_point(1, 2),
                 create_point(1, 2),
                 create_point(3, 4),
                 create_point(3, 4)
             };
+        }
         // The silly checkamajig
         func foo() -> bool {
             auto lhs = create_array();
             auto rhs = create_array();
             auto total = lhs @ rhs;
             auto is_equal =
                 check_pair(total, 0) &&
                 check_pair(total, 2) &&
                 check_pair(total, 4) &&
                 check_pair(total, 6);
             auto is_not_equal =
                 !check_pair(total, 0) ||
                 !check_pair(total, 2) ||
                 !check_pair(total, 4) ||
                 !check_pair(total, 6);
             auto has_correct_fields =
                 check_values(total, 3, 3, 4) &&
                 check_values(total, 4, 1, 2);
             return is_equal && !is_not_equal && has_correct_fields;
+        }
+        "
     ).for_function("foo", |f| {
         f.call(Some(Value::Bool(true)));
     });
+}
 #[test]
 fn test_struct_fields() {
     Tester::new_single_source_expect_ok("struct field access",
+"
 struct Nester<T> {
     T v,
+}
 func make<T>(T inner) -> Nester<T> {
     return Nester{ v: inner };
+}
 func modify<T>(Nester<T> outer, T inner) -> Nester<T> {
     outer.v = inner;
     return outer;
+}
 func foo() -> bool {
     // Single depth modification
     auto original1 = make<u32>(5);
     auto modified1 = modify(original1, 2);
     auto success1 = original1.v == 5 && modified1.v == 2;
     // Multiple levels of modification
     auto original2 = make(make(make(make(true))));
     auto modified2 = modify(original2.v, make(make(false))); // strip one Nester level
     auto success2 = original2.v.v.v.v == true && modified2.v.v.v == false;
     return success1 && success2;
+}
 ").for_function("foo", |f| {
         f.call(Some(Value::Bool(true)));
     });
+}
@@ \ No newline at end of file @@

src/protocol/tests/mod.rs

➞

Show inline comments

 /**
  * protocol/tests.rs
+ *
  * Contains tests for various parts of the lexer/parser and the evaluator of the
  * code. These are intended to be temporary tests such that we're sure that we
  * don't break existing functionality.
+ *
  * In the future these should be replaced by proper testing protocols.
  */
 mod utils;
 mod lexer;
 mod parser_validation;
 mod parser_inference;
 mod parser_monomorphs;
 mod parser_imports;
 mod eval_operators;
 mod eval_calls;
 mod eval_silly;
 pub(crate) use utils::{Tester};
@@ \ No newline at end of file @@
 pub(crate) use utils::{Tester}; // the testing harness
 pub(crate) use crate::protocol::eval::value::*; // to test functions
@@ \ No newline at end of file @@

src/protocol/tests/utils.rs

➞

Show inline comments

@@ @@ -617,51 +617,52 @@ pub(crate) struct VariableTester<'a> { @@
     assignment: &'a AssignmentExpression,
+}
 impl<'a> VariableTester<'a> {
     fn new(
         ctx: TestCtx<'a>, definition_id: DefinitionId, variable: &'a Variable, assignment: &'a AssignmentExpression
     ) -> Self {
         Self{ ctx, definition_id, variable, assignment }
+    }
     pub(crate) fn assert_parser_type(self, expected: &str) -> Self {
         let mut serialized = String::new();
         serialize_parser_type(&mut serialized, self.ctx.heap, &self.variable.parser_type);
         assert_eq!(
             expected, &serialized,
             "[{}] Expected parser type '{}', but got '{}' for {}",
             self.ctx.test_name, expected, &serialized, self.assert_postfix()
         );
         self
+    }
     pub(crate) fn assert_concrete_type(self, expected: &str) -> Self {
         let mut serialized = String::new();
         let lhs = self.ctx.heap[self.assignment.left].as_variable();
         serialize_concrete_type(
             &mut serialized, self.ctx.heap, self.definition_id,
-            &self.assignment.concrete_type
+            &lhs.concrete_type
         );
         assert_eq!(
             expected, &serialized,
             "[{}] Expected concrete type '{}', but got '{}' for {}",
             self.ctx.test_name, expected, &serialized, self.assert_postfix()
         );
         self
+    }
     fn assert_postfix(&self) -> String {
         format!("Variable{{ name: {} }}", self.variable.identifier.value.as_str())
+    }
+}
 pub(crate) struct ExpressionTester<'a> {
     ctx: TestCtx<'a>,
     definition_id: DefinitionId, // of the enclosing function/component
     expr: &'a Expression
+}
 impl<'a> ExpressionTester<'a> {
     fn new(
         ctx: TestCtx<'a>, definition_id: DefinitionId, expr: &'a Expression

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