Rollup merge of #132087 - ijchen:issue-131770-fix, r=dtolnay

Fix overly restrictive lifetime in `core::panic::Location::file` return type

Fixes #131770 by relaxing the lifetime to match what's stored in the struct. See that issue for more details and discussion.

Since this is a breaking change, I think a crater run is in order. Since this change should only have an effect at compile-time, I think just a check run is sufficient.

1 files changed, 9 insertions, 1 deletions

diff --git a/library/coretests/tests/panic/location.rs b/library/coretests/tests/panic/location.rs
index 910001bcc1c..a7db05a15c6 100644
--- a/library/coretests/tests/panic/location.rs
+++ b/library/coretests/tests/panic/location.rs
@@ -48,10 +48,18 @@ fn location_const_column() {
 }
 
 #[test]
+fn location_file_lifetime<'x>() {
+    // Verify that the returned `&str`s lifetime is derived from the generic
+    // lifetime 'a, not the lifetime of `&self`, when calling `Location::file`.
+    // Test failure is indicated by a compile failure, not a runtime panic.
+    let _: for<'a> fn(&'a Location<'x>) -> &'x str = Location::file;
+}
+
+#[test]
 fn location_debug() {
     let f = format!("{:?}", Location::caller());
     assert!(f.contains(&format!("{:?}", file!())));
-    assert!(f.contains("52"));
+    assert!(f.contains("60"));
     assert!(f.contains("29"));
 }