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-rw-r--r--src/liballoc/string.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index 2cb81029f95..79d1ccf637d 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -124,7 +124,7 @@ use boxed::Box;
 /// similar, but without the UTF-8 constraint. The second implication is that
 /// you cannot index into a `String`:
 ///
-/// ```ignore
+/// ```compile_fail,E0277
 /// let s = "hello";
 ///
 /// println!("The first letter of s is {}", s[0]); // ERROR!!!