Checkpoint

src/eval.rs

@@ -46,6 +46,8 @@ pub use value::Value;
 
 use crate::backend::BackendError;
 
+use self::primtype::UnknownPrimType;
+
 /// All of the errors that can happen trying to evaluate an NGR program.
 ///
 /// This is yet another standard [`thiserror::Error`] type, but with the
@@ -71,9 +73,13 @@ pub enum EvalError {
     ExitCode(std::process::ExitStatus),
     #[error("Unexpected output at runtime: {0}")]
     RuntimeOutput(String),
+    #[error("Cannot cast to function type: {0}")]
+    CastToFunction(String),
+    #[error(transparent)]
+    UnknownPrimType(#[from] UnknownPrimType),
 }
 
-impl PartialEq for EvalError {
+impl PartialEq<EvalError> for EvalError {
     fn eq(&self, other: &Self) -> bool {
         match self {
             EvalError::Lookup(a) => match other {
@@ -115,6 +121,16 @@ impl PartialEq for EvalError {
                 EvalError::RuntimeOutput(b) => a == b,
                 _ => false,
             },
+
+            EvalError::CastToFunction(a) => match other {
+                EvalError::CastToFunction(b) => a == b,
+                _ => false,
+            },
+
+            EvalError::UnknownPrimType(a) => match other {
+                EvalError::UnknownPrimType(b) => a == b,
+                _ => false,
+            },
         }
     }
 }