Auto merge of #52655 - kennytm:rollup, r=kennytm

Rollup of 10 pull requests

Successful merges:

 - #52538 (Remove obsolete flags in the i586_musl Dockerfile)
 - #52548 (Cursor: update docs to clarify Cursor only works with in-memory buffers)
 - #52605 (Do not suggest using `to_owned()` on `&str += &str`)
 - #52621 (Fix color detection for Windows msys terminals.)
 - #52622 (Use MultiSpan in E0707 and E709)
 - #52627 (Compile rustc before building tests for rustdoc)
 - #52637 (Don't use NonNull::dangling as sentinel value in Rc, Arc)
 - #52640 (Forget Waker when cloning LocalWaker)
 - #52641 (Simplify 2 functions in rustc_mir/dataflow)
 - #52642 (Replace a few expect+format combos with unwrap_or_else+panic)

Failed merges:

r? @ghost

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libsyntax_ext/format_foreign.rs b/src/libsyntax_ext/format_foreign.rs
index ff9663cdd3c..8ccb3be1ad9 100644
--- a/src/libsyntax_ext/format_foreign.rs
+++ b/src/libsyntax_ext/format_foreign.rs
@@ -232,11 +232,11 @@ pub mod printf {
     impl Num {
         fn from_str(s: &str, arg: Option<&str>) -> Self {
             if let Some(arg) = arg {
-                Num::Arg(arg.parse().expect(&format!("invalid format arg `{:?}`", arg)))
+                Num::Arg(arg.parse().unwrap_or_else(|_| panic!("invalid format arg `{:?}`", arg)))
             } else if s == "*" {
                 Num::Next
             } else {
-                Num::Num(s.parse().expect(&format!("invalid format num `{:?}`", s)))
+                Num::Num(s.parse().unwrap_or_else(|_| panic!("invalid format num `{:?}`", s)))
             }
         }