cl-ast: Add filename to File

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

compiler/cl-ast/src/ast.rs

@@ -34,6 +34,7 @@ pub enum Visibility {
 /// A list of [Item]s
 #[derive(Clone, Debug, Default, PartialEq, Eq, Hash)]
 pub struct File {
+    pub name: &'static str,
     pub items: Vec<Item>,
 }