feat!: Make linear types @inout by default; add @owned annotation

guppylang/tys/parsing.py

@@ -82,11 +82,11 @@ def _try_parse_defn(node: AstNode, globals: Globals) -> Definition | None:
     match node:
         case ast.Name(id=x):
             if x not in globals:
-                raise GuppyError("Unknown identifier", node)
+                raise GuppyError(f"Unknown identifier: {x}", node)
             return globals[x]
         case ast.Attribute(value=ast.Name(id=module_name) as value, attr=x):
             if module_name not in globals:
-                raise GuppyError("Unknown identifier", value)
+                raise GuppyError(f"Unknown identifier: {module_name}.{x}", value)
             module_def = globals[module_name]
             if not isinstance(module_def, ModuleDef):
                 raise GuppyError(