Assertion failed when casting argument to enum #1196

releasenotes.md

@@ -18,6 +18,7 @@
 - Casting a slice address to its pointer type should not compile #1193.
 - Union is not properly zero-initialized with designated initializer #1194.
 - Compile time fmod evaluates to 0 #1195.
+- Assertion failed when casting (unsigned) argument to enum #1196
 
 ### Stdlib changes
 - Add 'zstr' variants for `string::new_format` / `string::tformat`.

src/compiler/llvm_codegen_expr.c

@@ -1576,6 +1576,7 @@ void llvm_emit_cast(GenContext *c, CastKind cast_kind, Expr *expr, BEValue *valu
 				llvm_value_set(value, llvm_zext_trunc(c, value->value, llvm_get_type(c, to_type)), to_type);
 				return;
 			}
+			value->type = type_lowering(to_type);
 			return;
 		case CAST_SABOOL:
 			llvm_value_fold_optional(c, value);

test/test_suite/enumerations/enum_signed_cast_swap.c3t

@@ -0,0 +1,27 @@
+// #target: macos-x64
+module test;
+enum Abc : char { ABC }
+
+enum Mouse_Button {
+  LEFT,
+  RIGHT,
+  MIDDLE,
+}
+
+fn void foo(Mouse_Button button)
+{
+}
+
+fn int main() {
+  uint x = 1;
+  foo((Mouse_Button)x);
+  return 0;
+}
+
+/* #expect: test.ll
+
+  %x = alloca i32, align 4
+  store i32 1, ptr %x, align 4
+  %0 = load i32, ptr %x, align 4
+  call void @test.foo(i32 %0)
+  ret i32 0