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Improve type checking on polymorphic unions

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This commit is contained in:
gingerBill
2023-03-12 12:39:31 +00:00
parent c39bd7e089
commit bf91fcc6f7
1 changed files with 8 additions and 0 deletions
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8
src/check_type.cpp
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@@ -674,6 +674,10 @@ gb_internal void check_union_type(CheckerContext *ctx, Type *union_type, Ast *no
for_array(i, ut->variants) {
Ast *node = ut->variants[i];
Type *t = check_type_expr(ctx, node, nullptr);
if (union_type->Union.is_polymorphic && poly_operands == nullptr) {
// NOTE(bill): don't add any variants if this is this is an unspecialized polymorphic record
continue;
}
if (t != nullptr && t != t_invalid) {
bool ok = true;
t = default_type(t);
@@ -686,8 +690,12 @@ gb_internal void check_union_type(CheckerContext *ctx, Type *union_type, Ast *no
for_array(j, variants) {
if (are_types_identical(t, variants[j])) {
ok = false;
ERROR_BLOCK();
gbString str = type_to_string(t);
error(node, "Duplicate variant type '%s'", str);
if (j < ut->variants.count) {
error_line("\tPrevious found at %s\n", token_pos_to_string(ast_token(ut->variants[j]).pos));
}
gb_string_free(str);
break;
}