explain what happens in a test

diff --git a/tests/run-pass/transmute_fat2.rs b/tests/run-pass/transmute_fat2.rs
index 8cbe9a099bb6c1240683a733db1bca8df6fe44da..c667aab6bb5fdbd1f478b6f9a3dc8ebd401e1cc8 100644 (file)
--- a/tests/run-pass/transmute_fat2.rs
+++ b/tests/run-pass/transmute_fat2.rs
@@ -8,5 +8,6 @@ fn main() {
     let bad = unsafe {
         std::mem::transmute::<u64, &[u8]>(42)
     };
+    // This created a slice with length 0, so the following will fail the bounds check.
     bad[0];
 }

diff --git a/tests/run-pass/transmute_fat2.stderr b/tests/run-pass/transmute_fat2.stderr
index 08849a5b517a4e9e3a9fa6dd90e9879f4dedfdbe..2539e58814d6b833010b59851b04516f1757cd33 100644 (file)
--- a/tests/run-pass/transmute_fat2.stderr
+++ b/tests/run-pass/transmute_fat2.stderr
@@ -1 +1 @@
-thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', $DIR/transmute_fat2.rs:11:5
+thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', $DIR/transmute_fat2.rs:12:5