Error found:
in module Main
at tests/purs/failing/RoleDeclarationArityMismatchForeign4.purs:7:1 - 7:20 (line 7, column 1 - line 7, column 20)

  The type A expects 2 arguments but its role declaration lists only 1 role.

in role declaration for A

See https://github.com/purescript/documentation/blob/master/errors/RoleDeclarationArityMismatch.md for more information,
or to contribute content related to this error.