Files
scryer-prolog/src/prolog
Markus Triska 43f7743467 ENHANCED: Better error handling if Type is invalid.
Strictly speaking, type is currently not a type, so a domain error is
appropriate if Type is not a valid type. However, there are also other
cases where new types have been introduced in the past, and this
seems a good candidate for a new type. Let us hence use a type error.

Example:

    ?- can_be(listi, [a,b|Ls]).
    %@ ERROR: Type error: `type' expected, found `listi' (an atom)
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