]])
AT_BISON_CHECK([-v -o input.c input.y], 0, [],
-[[input.y:6.8-14: warning: symbol '"<="' used more than once as a literal string
+[[input.y:6.8-14: warning: symbol "<=" used more than once as a literal string
]])
AT_CLEANUP
# the user specification is eliminated.
AT_BISON_CHECK([-o input.c input.y], [[0]], [[]],
[[input.y:22.8-14: warning: symbol SPECIAL redeclared
-input.y:22.8-63: warning: symbol '"\\'?\"\a\b\f\n\r\t\v\001\201\001\201??!"' used more than once as a literal string
+input.y:22.8-63: warning: symbol "\\'?\"\a\b\f\n\r\t\v\001\201\001\201??!" used more than once as a literal string
]])
AT_COMPILE([input])