Usage of /usr/bin/goyacc:
  -l, --disable-line-directives   disable line directives
  -f, --fast-append               enable fast-append optimization
  -o, --output string             parser output (default "y.go")
  -p, --prefix string             name prefix to use in generated code (default "yy")
  -v, --verbose-output string     create parsing tables (default "y.output")