./x test --bless

Author: eduardorittner

tests/ui/feature-gates/feature-gate-split-pattern.rs

@@ -1,5 +1,5 @@
 pub fn main() {
     let a = &[1, 2, 3, 4, 5];
     let b = &[2, 3];
-    let mut c = a.split_pattern(b);
+    let mut c = a.split_pattern(b); //~ ERROR use of unstable library feature 'split_pattern'
 }

tests/ui/feature-gates/feature-gate-split-pattern.stderr

@@ -0,0 +1,13 @@
+error[E0658]: use of unstable library feature 'split_pattern'
+  --> $DIR/feature-gate-split-pattern.rs:4:19
+   |
+LL |     let mut c = a.split_pattern(b);
+   |                   ^^^^^^^^^^^^^
+   |
+   = note: see issue #49036 <https://github.com/rust-lang/rust/issues/49036> for more information
+   = help: add `#![feature(split_pattern)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0658`.