Menhir rule doesn't work in some case

[hackwaly]

Seems *.mly files must at the same level of _build directory?

src/jbuild file:

(jbuild_version 1)

(executable
 ((name main)))

(menhir
 ((merge_into parser)
  (modules (tokens parser))))

error message:

jbuilder build src/main.exe
      menhir src/parser.{ml,mli} (exit 1)
(cd _build/default && /Users/wenyuxiang/.opam/4.05.0/bin/menhir --base parser tokens.mly parser.mly)
Error: parser.mly: No such file or directory

@rgrinberg

[hackwaly]

Sorry, I didn't see #258 yet.

[ghost]

Actually it was a different bug. It's not fixed