Fix default parameter assignment checking

core/mem/mem.odin

@@ -27,6 +27,9 @@ set :: proc "contextless" (data: rawptr, value: byte, len: int) -> rawptr {
 zero :: proc "contextless" (data: rawptr, len: int) -> rawptr {
 	return set(data, 0, len);
 }
+zero_item :: proc "contextless" (item: $P/^$T) {
+	set(item, 0, size_of(T));
+}
 zero_slice :: proc "contextless" (data: $T/[]$E) {
 	if n := len(data); n > 0 {
 		zero(&data[0], size_of(E)*n);

src/check_type.cpp

@@ -1327,7 +1327,7 @@ ParameterValue handle_parameter_value(CheckerContext *ctx, Type *in_type, Type *
 	}
 
 	if (in_type) {
-		check_is_assignable_to(ctx, &o, in_type);
+		check_assignment(ctx, &o, in_type, str_lit("parameter value"));
 	}
 
 	if (out_type_) *out_type_ = default_type(o.type);

src/types.cpp

@@ -1042,7 +1042,7 @@ bool is_type_integer_endian_big(Type *t) {
 	} else if (t->kind == Type_BitSet) {
 		return is_type_integer_endian_big(bit_set_to_int(t));
 	} else {
-		GB_PANIC("Unsupported type: %s", type_to_string);
+		GB_PANIC("Unsupported type: %s", type_to_string(t));
 	}
 	return build_context.endian_kind == TargetEndian_Big;
 }
@@ -1059,7 +1059,7 @@ bool is_type_integer_endian_little(Type *t) {
 	} else if (t->kind == Type_BitSet) {
 		return is_type_integer_endian_little(bit_set_to_int(t));
 	} else {
-		GB_PANIC("Unsupported type: %s", type_to_string);
+		GB_PANIC("Unsupported type: %s", type_to_string(t));
 	}
 	return build_context.endian_kind == TargetEndian_Little;
 }