@tag didn't work with members #2236.

releasenotes.md

@@ -61,7 +61,8 @@
 - Overload resolution fixes to inline typedef #2226.
 - `math::overflow_*` wrappers incorrectly don't allow distinct integers #2221.
 - Compiler segfault when using distinct type in attribute imported from other module #2234.
-- Assert casting bitstruct to short/char #2237
+- Assert casting bitstruct to short/char #2237.
+- @tag didn't work with members #2236.
 
 ### Stdlib changes
 - Deprecate `String.is_zstr` and `String.quick_zstr` #2188.

src/compiler/sema_decls.c

@@ -3594,6 +3594,7 @@ static bool sema_analyse_attributes_inner(SemaContext *context, ResolvedAttrData
 static bool sema_analyse_attributes(SemaContext *context, Decl *decl, Attr **attrs, AttributeDomain domain,
 									bool *erase_decl)
 {
+	if (decl->resolved_attributes) return true;
 	ResolvedAttrData data = { .tags = NULL, .overload = INVALID_SPAN };
 	if (!sema_analyse_attributes_inner(context, &data, decl, attrs, domain, NULL, erase_decl)) return false;
 	if (*erase_decl) return true;

test/test_suite/union/member_tag.c3

@@ -0,0 +1,13 @@
+struct Test
+{
+	union a @tag("a", 1)
+	{
+		int x;
+	}
+}
+
+fn int main(String[] args)
+{
+	$assert(Test.a.has_tagof("a")); // Error: Compile time assert failed.
+	return 0;
+}