defer skolem issue from unsolved meta application

src/Lib/Types.idr

@@ -471,6 +471,16 @@ export partial
 Show Context where
   show ctx = "Context \{show $ map fst $ ctx.types}"
 
+export
+errorMsg : Error -> String
+errorMsg (E x str) = str
+errorMsg (Postpone x k str) = str
+
+export
+HasFC Error where
+  getFC (E x str) = x
+  getFC (Postpone x k str) = x
+
 export
 error : FC -> String -> M a
 error fc msg = throwError $ E fc msg