./x.py test should be able to run individual tests

[Manishearth]

Currently to run an individual test, you have to run ./x.py test src/test/run-pass --test-args foo.rs. This isn't very obvious; it would be nice if src/test was special cased such that ./x.py test ./x.py test src/test/run-pass/foo.rs works

Relevant code: https://github.com/rust-lang/rust/blob/master/src/bootstrap/test.rs

[Mark-Simulacrum]

I agree that it'd be nice, but I think this would require some refactoring in compiletest as well -- currently it only accepts filters by test name (which we could sort of do, but it'd be imprecise) but not quite more than that.

[Manishearth]

For the scope of this bug we can just transform test src/test/run-pass/foo.rs into test src/test/run-pass --test-args foo.rs. This may match multiple tests, but it's close enough. Adding a specific argument for this to compiletest would be the next step.

[pvdrz]

I'd like to take care of this

[pvdrz]

Sorry, I haven't been able to work on this. If anyone else wants to take it, feel free to do it

[collin5]

@christianpoveda No problem. Will give this a try as my first contribution.