diff --git a/src/runtime/retired/errors.rs b/src/runtime/retired/errors.rs
new file mode 100644
index 0000000000000000000000000000000000000000..13e0b13fcdb65e7fc63feecce192c378817c2714
--- /dev/null
+++ b/src/runtime/retired/errors.rs
@@ -0,0 +1,94 @@
+use crate::common::*;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum PortBindErr {
+    AlreadyConnected,
+    IndexOutOfBounds,
+    NotConfigured,
+    ParseErr,
+    AlreadyConfigured,
+}
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum ReadGottenErr {
+    NotConnected,
+    IndexOutOfBounds,
+    WrongPolarity,
+    NoPreviousRound,
+    DidNotGet,
+}
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum PortOpErr {
+    IndexOutOfBounds,
+    NotConnected,
+    WrongPolarity,
+    DuplicateOperation,
+}
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum ConfigErr {
+    AlreadyConnected,
+    ParseErr(String),
+    AlreadyConfigured,
+    NoSuchComponent,
+    NonPortTypeParameters,
+}
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum ConnectErr {
+    PortNotBound { native_index: usize },
+    NotConfigured,
+    AlreadyConnected,
+    MetaProtocolDeviation,
+    Disconnected,
+    PollInitFailed,
+    MessengerRecvErr(MessengerRecvErr),
+    Timeout,
+    PollingFailed,
+    PolarityMatched(SocketAddr),
+    AcceptFailed(SocketAddr),
+    PassiveConnectFailed(SocketAddr),
+    BindFailed(SocketAddr),
+}
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum PollDeadlineErr {
+    PollingFailed,
+    Timeout,
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum EndpointErr {
+    Disconnected,
+    MetaProtocolDeviation,
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum SyncErr {
+    NotConnected,
+    MessengerRecvErr(MessengerRecvErr),
+    Inconsistent,
+    Timeout,
+    ElaborateFromNonChild,
+    AnnounceFromNonParent,
+    PayloadPremiseExcludesTheChannel(ChannelId),
+    UnexpectedSetupMsg,
+    EndpointErr(EndpointErr),
+    EvalErr(EvalErr),
+}
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum EvalErr {
+    ComponentExitWhileBranching,
+}
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum MessengerRecvErr {
+    PollingFailed,
+    EndpointErr(PortId, EndpointErr),
+}
+impl From<MainComponentErr> for ConfigErr {
+    fn from(e: MainComponentErr) -> Self {
+        use ConfigErr as C;
+        use MainComponentErr as M;
+        match e {
+            M::NoSuchComponent => C::NoSuchComponent,
+            M::NonPortTypeParameters => C::NonPortTypeParameters,
+            _ => todo!(),
+        }
+    }
+}