cl-ast: Add filename to File

- Better error reporting
- Better pizza
- Papa Cow's

compiler/cl-ast/src/ast_visitor/fold.rs

@@ -44,8 +44,8 @@ pub trait Fold {
         s
     }
     fn fold_file(&mut self, f: File) -> File {
-        let File { items } = f;
-        File { items: items.into_iter().map(|i| self.fold_item(i)).collect() }
+        let File { name, items } = f;
+        File { name, items: items.into_iter().map(|i| self.fold_item(i)).collect() }
     }
     fn fold_attrs(&mut self, a: Attrs) -> Attrs {
         let Attrs { meta } = a;

compiler/cl-ast/src/ast_visitor/visit.rs

@@ -26,7 +26,7 @@ pub trait Visit<'a>: Sized {
     fn visit_smuggled_float(&mut self, _f: &'a u64) {}
     fn visit_string(&mut self, _s: &'a str) {}
     fn visit_file(&mut self, f: &'a File) {
-        let File { items } = f;
+        let File { name: _, items } = f;
         items.iter().for_each(|i| self.visit_item(i));
     }
     fn visit_attrs(&mut self, a: &'a Attrs) {