travis-ci/travis-build — comment on commit 0fb88bf12519ad38a377018364aca871bd0d1431
File: lib/travis/build/job/test.rb line 115
By michaelklishin:

This is where we export "system" variables like `TRAVIS_RUBY_VERSION`. People keep asking for it but this is something that cannot be set from `.travis.yml`. So no, we can't merge this.