Fixes: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269906
I get the following warnings when building libdtrace with this patch:
/usr/src/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l:410: warning, trailing context made variable due to preceding '|' action /usr/src/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l:409: warning, dangerous trailing context /usr/src/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l:409: warning, dangerous trailing context yacc: 1 shift/reduce conflict.