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The parser combinator withMessage("error message"_err_en_US, PARSER) is meant
to run the parser PARSER and, if it fails, override its error messages if
it failed silently or it was unable to recognize any tokens at all. This
gives the parser a way to avoid emitting some confusing or missing error
messages. Unfortunately, the implementation could sometimes lose track of
whether any tokens had been recognized, leading to problems with outer usage
of withMessage() and also -- more seriously -- with ParseState::CombineFailedParses().
That's a utility that determines which error messages to retain when two
or more parsers have been attempted at the same starting point and none
of them succceed. Its policy is to retain the state from the parser that
consumed the most input text before failing, so long as it had recognized at
least one token.
So anyway, fix up withMessage(), adjust the tests, and add a test of the
original motivating confusing error situation, in which a syntax error in
a COMMON statement was being diagnosed as a problem with a statement function
definition because withMessage() had lost the fact that the parse of the
COMMON statement had recognized some tokens, and the last attempted parse
later was a failed attempt to parse a statement function.
Differential Revision: https://reviews.llvm.org/D135216
49 lines
1.3 KiB
Fortran
49 lines
1.3 KiB
Fortran
! RUN: %python %S/test_errors.py %s %flang_fc1
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! This test checks for errors in sync all statements based on the
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! statement specification in section 11.6.3 of the Fortran 2018 standard.
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program test_sync_all
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implicit none
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integer sync_status
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character(len=128) error_message
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!___ standard-conforming statement ___
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sync all
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sync all()
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sync all(stat=sync_status)
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sync all( errmsg=error_message)
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sync all(stat=sync_status, errmsg=error_message)
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!___ non-standard-conforming statement ___
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!______ invalid sync-stat-lists: invalid stat= ____________
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!ERROR: expected end of statement
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sync all(status=sync_status)
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! Invalid sync-stat-list: missing stat-variable
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!ERROR: expected end of statement
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sync all(stat)
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! Invalid sync-stat-list: missing 'stat='
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!ERROR: expected end of statement
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sync all(sync_status)
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!______ invalid sync-stat-lists: invalid errmsg= ____________
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! Invalid errmsg-variable keyword
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!ERROR: expected end of statement
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sync all(errormsg=error_message)
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! Invalid sync-stat-list: missing 'errmsg='
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!ERROR: expected end of statement
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sync all(error_message)
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! Invalid sync-stat-list: missing errmsg-variable
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!ERROR: expected end of statement
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sync all(errmsg)
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end program test_sync_all
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