* tests/guix-lint.sh: Remove redundant and non-portable 'export'.
* tests/guix-lint.sh (dummy)[description]: Add failing case. [doc]: Adjust.
* guix/scripts/lint.scm: add the "--checkers" option. * doc/guix.texi (Invoking guix lint): Document it. * tests/guix-lint.sh: New file * Makefile.am (SCM_TESTS): Add it.