chore: run tests in metaprogramming.rs (#6339)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*

These tests weren't being run because of a missing `mod
metaprogramming;`. I've also added a test for a requested feature from
another team.

## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

compiler/noirc_frontend/src/tests.rs

@@ -2,6 +2,7 @@
 
 mod bound_checks;
 mod imports;
+mod metaprogramming;
 mod name_shadowing;
 mod references;
 mod traits;

compiler/noirc_frontend/src/tests/metaprogramming.rs

@@ -1,6 +1,9 @@
-use crate::hir::def_collector::dc_crate::CompilationError;
+use crate::hir::{
+    def_collector::dc_crate::CompilationError, resolution::errors::ResolverError,
+    type_check::TypeCheckError,
+};
 
-use super::get_program_errors;
+use super::{assert_no_errors, get_program_errors};
 
 // Regression for #5388
 #[test]
@@ -74,3 +77,22 @@ fn unquoted_integer_as_integer_token() {
 
     assert_no_errors(src);
 }
+
+#[test]
+fn allows_references_to_structs_generated_by_macros() {
+    let src = r#"
+    comptime fn make_new_struct(_s: StructDefinition) -> Quoted {
+        quote { struct Bar {} }
+    }
+
+    #[make_new_struct]
+    struct Foo {}
+
+    fn main() {
+        let _ = Foo {};
+        let _ = Bar {};
+    }
+    "#;
+
+    assert_no_errors(src);
+}