diff --git a/src/protocol/input_source.rs b/src/protocol/input_source.rs
index 0a5304926c32cb91d49059c198624c10c6bd0e59..b3eb530d5c0239c2995b518292930027916e8df5 100644
--- a/src/protocol/input_source.rs
+++ b/src/protocol/input_source.rs
@@ -21,6 +21,12 @@ pub struct InputSpan {
 }
 
 impl InputSpan {
+    // This will only be used for builtin functions
+    #[inline]
+    pub fn new() -> InputSpan {
+        InputSpan{ begin: InputPosition{ line: 0, offset: 0 }, end: InputPosition{ line: 0, offset: 0 }}
+    }
+
     #[inline]
     pub fn from_positions(begin: InputPosition, end: InputPosition) -> Self {
         Self { begin, end }