fix: use correct type for attribute arguments (#6640)

Author: asterite

compiler/noirc_frontend/src/elaborator/comptime.rs

@@ -329,15 +329,14 @@ impl<'context> Elaborator<'context> {
                 push_arg(Value::TraitDefinition(trait_id));
             } else {
                 let (expr_id, expr_type) = interpreter.elaborator.elaborate_expression(arg);
-                push_arg(interpreter.evaluate(expr_id)?);
-
                 if let Err(UnificationError) = expr_type.unify(param_type) {
                     return Err(InterpreterError::TypeMismatch {
                         expected: param_type.clone(),
                         actual: expr_type,
                         location: arg_location,
                     });
                 }
+                push_arg(interpreter.evaluate(expr_id)?);
             };
         }
 

compiler/noirc_frontend/src/tests/metaprogramming.rs

@@ -141,3 +141,23 @@ fn errors_if_macros_inject_functions_with_name_collisions() {
         ) if contents == "foo"
     ));
 }
+
+#[test]
+fn uses_correct_type_for_attribute_arguments() {
+    let src = r#"
+    #[foo(32)]
+    comptime fn foo(_f: FunctionDefinition, i: u32) {
+        let y: u32 = 1;
+        let _ = y == i;
+    }
+
+    #[bar([0; 2])]
+    comptime fn bar(_f: FunctionDefinition, i: [u32; 2]) {
+        let y: u32 = 1;
+        let _ = y == i[0];
+    }
+
+    fn main() {}
+    "#;
+    assert_no_errors(src);
+}