Checkpoint

src/ir/eval.rs

@@ -1,8 +1,7 @@
+use super::{Primitive, Type, ValueOrRef};
 use crate::eval::{EvalEnvironment, EvalError, Value};
 use crate::ir::{Expression, Program, Statement, TopLevel};
 
-use super::{Primitive, Type, ValueOrRef};
-
 impl Program {
     /// Evaluate the program, returning either an error or a string containing everything
     /// the program printed out.
@@ -14,7 +13,7 @@ impl Program {
 
         for stmt in self.items.iter() {
             match stmt {
-                TopLevel::Function(_, _, _) => unimplemented!(),
+                TopLevel::Function(_, _, _, _) => unimplemented!(),
 
                 TopLevel::Statement(Statement::Binding(_, name, _, value)) => {
                     let actual_value = value.eval(&env)?;
@@ -43,6 +42,7 @@ impl Expression {
 
                 match t {
                     Type::Primitive(pt) => Ok(pt.safe_cast(&value)?),
+                    Type::Function(_, _) => Err(EvalError::CastToFunction(t.to_string())),
                 }
             }