Bad import error message confusing

[alxmrs]

I was writing a recipe and was including schemas from another file. I put the import in but forgot to include the .arcs file I was importing in the srcs of the BUILD rule.

The error message I would've hoped to get would've said something like:
Cannot find import feature_schemas.arcs, did you include it in BUILD?.

Error importing '.../impl/feature_schemas.arcs'
  import '.../impl/feature_schemas.arcs'
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: Could not infer type of 'sessionId' field