Unexpected existence_error message

[flexoron]

$ scryer-prolog -f
?- [user]. t :- (a(1)*a(2)). a(X):-write(X). a(X):-write(X). end_of_file.
?- t.
   error(existence_error(procedure,(*)/2),(*)/2). % Expected

?- [user]. t :- (a(1)*->a(2)). a(X):-write(X). a(X):-write(X). end_of_file.
?- % Prompt unexpected, expecting: % Warning: overwriting t/0 or better % Error: Syntax error: Operator expected
?- t.
   error(existence_error(procedure,(*)/2),(*)/2). % Unexpected
?- halt.

$ scryer-prolog -f
?- [user]. t :- (a(1)*->a(2)). a(X):-write(X). a(X):-write(X). end_of_file.
?- % Prompt unexpected, expecting: Syntax error: Operator expected
?- t.
   error(existence_error(procedure,t/0),t/0). % Unexpected
?-

[hurufu]

Yes, I would expect error(syntax_error(incomplete_reduction),read_term/3:2) error message.

[flexoron]

Is there a reason why no hint appended?
error(syntax_error(incomplete_reduction),read_term/3:2, operator expected

[hurufu]

No, there is no reason, I just posted minimal message that I would consider "correct" (modulo line number).