shift/reduce conflicts in macroprocessor build
bison -W -o MacroBison.cc MacroBison.yy
MacroBison.yy: warning: 1 shift/reduce conflict [-Wconflicts-sr]
MacroBison.yy: warning: 2 reduce/reduce conflicts [-Wconflicts-rr]
introduced in 3e5c8dd80de98ce4b6e5bdb65cd0c4af8a9eceb2