Akim Demaille 0b585c49ae diagnostics: display suggested update after the caret-info ...

This commit adds the suggestion in green, on the line below the
caret-and-tildes.

    foo.y:1.1-14: warning: deprecated directive: '%error-verbose', use '%define parse.error verbose' [-Wdeprecated]
        1 | %error-verbose
          | ^~~~~~~~~~~~~~
          | %define parse.error verbose

The current approach, with location_caret_suggestion, is fragile:
there's a protocol of calls to the complain functions which is strict.
We should rather have a richer structure describing the diagnostics,
including with submessages such as the suggestions, passed in the end
to the routines in charge of formatting and printing them.

* src/location.h, src/location.c (location_caret_suggestion): New.
* src/complain.c (deprecated_directive): Use it.
* tests/diagnostics.at, tests/input.at: Adjust expectations.

2019-10-06 08:07:57 +02:00

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