Bison 3.7 fails
For some reason, Bison 3.7 fails to build our parser:
+ bison -Wall -d -r all parser.yy
time limit exceeded: 6.000000
time limit exceeded: 6.000000
time limit exceeded: 6.000000
time limit exceeded: 6.000000
time limit exceeded: 6.000000
time limit exceeded: 6.000000
time limit exceeded: 6.000000
^C
The last version that is known to work is Bison 3.4.