Fix #complete switch with pointer case doesn't compile #416

src/check_stmt.cpp

@@ -1205,7 +1205,7 @@ void check_type_switch_stmt(CheckerContext *ctx, Ast *node, u32 mod_flags) {
 					GB_PANIC("Unknown type to type switch statement");
 				}
 
-				if (ptr_set_exists(&seen, y.type)) {
+				if (type_ptr_set_exists(&seen, y.type)) {
 					TokenPos pos = cc->token.pos;
 					gbString expr_str = expr_to_string(y.expr);
 					error(y.expr,
@@ -1257,7 +1257,7 @@ void check_type_switch_stmt(CheckerContext *ctx, Ast *node, u32 mod_flags) {
 
 		for_array(i, variants) {
 			Type *t = variants[i];
-			if (!ptr_set_exists(&seen, t)) {
+			if (!type_ptr_set_exists(&seen, t)) {
 				array_add(&unhandled, t);
 			}
 		}

src/types.cpp

@@ -551,8 +551,27 @@ i64      type_offset_of             (Type *t, i32 index);
 gbString type_to_string             (Type *type);
 void     init_map_internal_types(Type *type);
 Type *   bit_set_to_int(Type *t);
+bool are_types_identical(Type *x, Type *y);
 
 
+bool type_ptr_set_exists(PtrSet<Type *> *s, Type *t) {
+	if (ptr_set_exists(s, t)) {
+		return true;
+	}
+
+	// TODO(bill, 2019-10-05): This is very slow and it's probably a lot
+	// faster to cache types correctly
+	for_array(i, s->entries) {
+		Type *f = s->entries[i].ptr;
+		if (are_types_identical(t, f)) {
+			ptr_set_add(s, t);
+			return true;
+		}
+	}
+
+	return false;
+}
+
 Type *base_type(Type *t) {
 	for (;;) {
 		if (t == nullptr) {