rustc: test: don't silently ignore bad benches

[emberian]

This is adequate because when a function has a type that isn't caught here,
that is, it has a single argument, but it isn't &mut BenchHarness, it
errors later on with:

 error: mismatched types: expected `fn(&mut test::BenchHarness)` but found
`fn(int)` (expected &-ptr but found int)

which I consider acceptable.

Closes #12997

[alexcrichton]

This looks good to me, but I don't think it closes #12997 because it still doesn't typecheck the signature. All it's doing is making sure that it's the right number of arguments.

r=me if you change the PR description and commit message to not close the issue

[emberian]

It's already typechecked if the function modified here passes. See the PR
description.

On Tue, Mar 18, 2014 at 11:09 AM, Alex Crichton notifications@github.comwrote:

This looks good to me, but I don't think it closes #12997https://github.com/mozilla/rust/issues/12997because it still doesn't typecheck the signature. All it's doing is making
sure that it's the right number of arguments.

r=me if you change the PR description and commit message to not close the
issue

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[alexcrichton]

Oops, sorry about that! Could you add a test for that as well?

[emberian]

@alexcrichton r? added test