Currently the suggestion to rerun is a -Wother warning:
warning: 2 shift/reduce conflicts [-Wconflicts-sr]
warning: rerun with option '-Wcounterexamples' to generate conflict counterexamples [-Wother]
Instead, let's attach it as a subnote of the diagnostic (in the
current case, -Wconflicts-sr):
warning: 2 shift/reduce conflicts [-Wconflicts-sr]
note: rerun with option '-Wcounterexamples' to generate conflict counterexamples
* src/conflicts.c (conflicts_print): Do that.
Adjust the test suite.