update test

Author: DebugSteven

src/test/ui/error-trait/error-in-panic.rs

@@ -4,6 +4,7 @@
 #![allow(unused_imports)]
 #![feature(core_panic)]
 #![feature(error_in_core)]
+#![feature(error_in_panic)]
 
 extern crate core;
 

src/test/ui/error-trait/error-in-panic.run.stderr

@@ -1,6 +1,8 @@
-thread 'main' panicked at 'here's my panic error message', $DIR/error-in-panic.rs:49:5
+thread 'main' panicked at 'here's my panic error message', $DIR/error-in-panic.rs:50:5
+
 Source: my source error message
 
 Caused by:
       my source's source error message
+
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace