Handle member access in struct with union as const arg

Closes #228

Author: steeve

src/Translator.zig

@@ -557,7 +557,7 @@ fn transRecordDecl(t: *Translator, scope: *Scope, record_qt: QualType) Error!voi
                 field_name = try std.fmt.allocPrint(t.arena, "unnamed_{d}", .{unnamed_field_count});
                 unnamed_field_count += 1;
                 try t.anonymous_record_field_names.put(t.gpa, .{
-                    .parent = base.qt,
+                    .parent = base.qt.unqualified(),
                     .field = field.qt,
                 }, field_name);
             }
@@ -3066,7 +3066,7 @@ fn transMemberAccess(
     const record = base_info.getRecord(t.comp).?;
     const field = record.fields[member_access.member_index];
     const field_name = if (field.name_tok == 0) t.anonymous_record_field_names.get(.{
-        .parent = base_info.base(t.comp).qt,
+        .parent = base_info.base(t.comp).qt.unqualified(),
         .field = field.qt,
     }).? else field.name.lookup(t.comp);
     const base_node = opt_base orelse try t.transExpr(scope, member_access.base, .used);

test/cases/translate/member_access_in_struct_with_union_as_const_arg.c

@@ -0,0 +1,12 @@
+#define SUFFIXED(x) x##_suffix
+
+struct my_struct {
+  union {
+    int SUFFIXED(internal);
+    double d;
+  };
+};
+
+int my_func(const struct my_struct* s) {
+    return s->SUFFIXED(internal);
+}