This PR proposes to move from physical equality to equality of the identifiers.
This will be needed as we plan to make gospel type checker modular (see #377): different files will be typed by different runs of the gospel program and physical equality won't hold between these runs.
This PR proposes to move from physical equality to equality of the identifiers.
This will be needed as we plan to make gospel type checker modular (see #377): different files will be typed by different runs of the gospel program and physical equality won't hold between these runs.