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This is more consistent, and brings benefits: users know that these
diagnostics are attached to -Wcounterexamples, and they can also click
on the hyperlink if permitted by their terminal.
We go from
warning: 1 reduce/reduce conflict [-Wconflicts-rr]
Reduce/reduce conflict on token $end:
Example A b .
First derivation a -> [ A b . ]
Second derivation a -> [ A b -> [ b . ] ]
to
warning: 1 reduce/reduce conflict [-Wconflicts-rr]
input.y: warning: reduce/reduce conflict on token $end [-Wcounterexamples]
Example A b .
First derivation a -> [ A b . ]
Second derivation a -> [ A b -> [ b . ] ]
with an hyperlink on -Wcounterexamples.
* src/counterexample.c (counterexample_report_reduce_reduce):
Use complain.
* tests/counterexample.at, tests/diagnostics.at, tests/report.at:
Adjust.