Fix grammar in test description

ecstatic-morse · Centril · ecstatic-morse · commit b3aecd0d55d8 · 2019-12-13T10:39:14.000-08:00
Co-Authored-By: Mazdak Farrokhzad &lt;twingoow@gmail.com&gt;
diff --git a/src/test/ui/consts/control-flow/loop.rs b/src/test/ui/consts/control-flow/loop.rs
@@ -1,4 +1,4 @@
-// Ensure that loops are forbidden in a const context unless `#![feature(const_loop)]` are enabled.
+// Ensure that loops are forbidden in a const context unless `#![feature(const_loop)]` is enabled.
 // `while` loops require `#![feature(const_if_match)]` to be enabled as well.
 
 // gate-test-const_loop

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		-// Ensure that loops are forbidden in a const context unless `#![feature(const_loop)]` are enabled.
	`1`	+// Ensure that loops are forbidden in a const context unless `#![feature(const_loop)]` is enabled.
`2`	`2`	// `while` loops require `#![feature(const_if_match)]` to be enabled as well.
`3`	`3`
`4`	`4`	`// gate-test-const_loop`