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, 5 insertions, 4 deletions

diff --git a/src/test/debug-info/struct-in-enum.rs b/src/test/debug-info/struct-in-enum.rs
index 98ded437273..b706ad1c38c 100644
--- a/src/test/debug-info/struct-in-enum.rs
+++ b/src/test/debug-info/struct-in-enum.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-tidy-linelength
 // xfail-android: FIXME(#10381)
 
 // compile-flags:-Z extra-debug-info
@@ -28,9 +29,9 @@
 #[allow(unused_variable)];
 
 struct Struct {
-	x: u32,
-	y: i32,
-	z: i16
+    x: u32,
+    y: i32,
+    z: i16
 }
 
 // The first element is to ensure proper alignment, irrespective of the machines word size. Since
@@ -42,7 +43,7 @@ enum Regular {
 }
 
 enum Univariant {
-	TheOnlyCase(Struct)
+    TheOnlyCase(Struct)
 }
 
 fn main() {