Some error output going to stdout

[Woosuk Kwak (Bubbler)]

It looks like parts of some error messages are printed to stdout. I think they should all go to stderr instead.

Syntax error example:

main?

stderr:

*** SYNTAX ERROR *** (1-1) wrong rule. main?<<HERE>> *** error(syntax_error,picat)

stdout:

1 error(s)

Similar problem seems to exist with other kinds of errors, such as those caused by main=>1. or main=>A=[],print(A[1]).

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