Relax FAM to use for array

src/cc/frontend/parser_expr.c

@@ -697,12 +697,6 @@ static Type *parse_direct_declarator_suffix(Type *type) {
       if (basetype->qualifier & TQ_CONST)
         type->qualifier |= TQ_CONST;
     }
-
-    // Flexible array struct not allowd.
-    if (basetype->kind == TY_STRUCT) {
-      if (basetype->struct_.info != NULL && basetype->struct_.info->is_flexible)
-        parse_error(PE_NOFATAL, tok, "using flexible array as an array not allowed.");
-    }
   } else if (match(TK_LPAR)) {
     bool vaargs;
     Vector *param_vars = parse_funparams(&vaargs);

tests/test.sh

@@ -175,8 +175,9 @@ test_struct() {
   compile_error 'union for struct' 'struct Foo{int x;}; int main(){ union Foo foo; (void)foo; }'
   compile_error 'no member name' 'struct Foo{union{int anon;}; int;}; int main(){}'
   compile_error 'FAM must be last' 'struct Foo{int a; int b[]; int y;}; int main(){}'
-  compile_error 'FAM cannot array' 'struct Foo{int a; int b[];}; struct Foo x[5]; int main(){}'
-  compile_error 'FAM cannot struct' 'struct Foo{int a; int b[];}; struct Bar {struct Foo foo; int x;}; int main(){}'
+  try_direct 'FAM array' 20 'struct Foo{int a; int b[];}; struct Foo x[5]; int main(){return sizeof(x);}'
+  compile_error 'FAM not last in struct' 'struct Foo{int a; int b[];}; struct Bar {struct Foo foo; int x;}; int main(){}'
+  try_direct 'FAM at last in struct' 8 'struct Foo{int a; int b[];}; struct Bar {int x; struct Foo foo;}; int main(){return sizeof(struct Bar);}'
 
   end_test_suite
 }