auto merge of #12055 : dguenther/rust/tidy_test, r=alexcrichton

This PR extends the tidy formatting check to rust files in the test folder. To facilitate this, a few flags were added to tidy:

* `xfail-tidy-cr` - Disables the check for CR characters for all following lines in the file
* `xfail-tidy-tab` - Disables the check for tab characters for all following lines in the file
* `xfail-tidy-linelength` - Disables the line length check for all following lines in the file

Checks should not have to be disabled often. I disabled line length checks in `debug-info` tests that use `debugger:` checks, but aside from that, there were relatively few exclusions. Running tidy on all the tests does slow down the formatting check, so it may be worth investigating further optimization.

cc #4534

1 files changed, 2 insertions, 1 deletions

diff --git a/src/test/run-pass/trait-object-generics.rs b/src/test/run-pass/trait-object-generics.rs
index ebde7e787e4..e2422a1dcf5 100644
--- a/src/test/run-pass/trait-object-generics.rs
+++ b/src/test/run-pass/trait-object-generics.rs
@@ -17,7 +17,8 @@ pub trait Trait2<A> {
 pub struct Impl<A1, A2, A3> {
     /*
      * With A2 we get the ICE:
-     * task <unnamed> failed at 'index out of bounds: the len is 1 but the index is 1', /home/tortue/rust_compiler_newest/src/librustc/middle/subst.rs:58
+     * task <unnamed> failed at 'index out of bounds: the len is 1 but the index is 1',
+     * src/librustc/middle/subst.rs:58
      */
     t: ~Trait2<A2>
 }