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, 3 insertions, 1 deletions

diff --git a/src/test/compile-fail/no_freeze-struct.rs b/src/test/compile-fail/no_freeze-struct.rs
index 9ac7966e704..c85574438ba 100644
--- a/src/test/compile-fail/no_freeze-struct.rs
+++ b/src/test/compile-fail/no_freeze-struct.rs
@@ -16,5 +16,7 @@ fn bar<T: Freeze>(_: T) {}
 
 fn main() {
     let x = Foo { a: 5, m: marker::NoFreeze };
-    bar(x); //~ ERROR instantiating a type parameter with an incompatible type `Foo`, which does not fulfill `Freeze`
+    bar(x);
+    //~^ ERROR instantiating a type parameter with an incompatible type `Foo`,
+    //         which does not fulfill `Freeze`
 }