Further improvements for TR's error messages.
Further improvements for TR's error messages.

Only the most permissive domains whose associated return type is
consistent with the expected type are shown in error messages.

For example, for a function with the following type:
Fixnum -> Fixnum
Integer -> Integer
and an expected type of Integer, only the latter domain is shown in
the error message.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket