From 60bbe8786a7851e29e520fd187112e55cf44c34d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jacek=20=C5=9Awierk?= <jacekswierk@gmail.com>
Date: Sun, 1 Mar 2026 14:42:43 +0100
Subject: [PATCH] Add Rust panic message pattern (bug#80403)

* etc/compilation.txt: Add example.
* lisp/progmodes/compile.el (compilation-error-regexp-alist-alist):
New rule.
* test/lisp/progmodes/compile-tests.el (compile-tests--test-regexps-data)
(compile-test-error-regexps): Add test case.

Copyright-paperwork-exempt: yes
---
 etc/compilation.txt                  |  5 ++++-
 lisp/progmodes/compile.el            | 12 ++++++++++++
 test/lisp/progmodes/compile-tests.el |  6 +++++-
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/etc/compilation.txt b/etc/compilation.txt
index c2a0967c6a5..801d262f5aa 100644
--- a/etc/compilation.txt
+++ b/etc/compilation.txt
@@ -489,7 +489,7 @@ Fatal error: Call to undefined function: mysql_pconnect() in db.inc on line 66
 
 * Rust
 
-symbol: rust
+symbol: rust rust-panic
 
 error[E0277]: `Foo` is not an iterator
   --> src/main.rs:4:16
@@ -498,6 +498,9 @@ warning: borrow of packed field is unsafe and requires unsafe function or block
 note: required by a bound in `Trait`
   --> src/auxiliary/trait-debuginfo.rs:23:18
 
+thread 'main' (1234) panicked at library/std/src/io/stdio.rs:30:40:
+    thread 'main' (1234) panicked at library/std/src/io/stdio.rs:50:60:
+
 * Ruby
 
 symbol: ruby
diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index d2e92d7da8b..9c805b96b43 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -405,6 +405,18 @@ of[ \t]+\"?\\([a-zA-Z]?:?[^\":\n]+\\)\"?:" 3 2 nil (1))
     (ruby-Test::Unit
      "^    [[ ]?\\([^ (].*\\):\\([1-9][0-9]*\\)\\(\\]\\)?:in " 1 2)
 
+    (rust-panic
+     ,(rx bol (opt "    ")
+          "thread '" (+ nonl) "' " (? "(" (+ digit) ") ")
+          (group-n 1 "panicked" ) " at"
+          " " (group-n 2 (+ nonl))  ; file
+          ":" (group-n 3 (+ digit)) ; line
+          ":" (group-n 4 (+ digit)) ; column
+          ":" eol)
+     2 3 4 nil
+     nil
+     (1 compilation-error-face))
+
     ;; Tested with Lua 5.1, 5.2, 5.3, 5.4, and LuaJIT 2.1.
     (lua
      ,(rx bol
diff --git a/test/lisp/progmodes/compile-tests.el b/test/lisp/progmodes/compile-tests.el
index eeb8fcf6eee..67a713857e3 100644
--- a/test/lisp/progmodes/compile-tests.el
+++ b/test/lisp/progmodes/compile-tests.el
@@ -384,6 +384,10 @@
     (rust
      "note: required by a bound in `Trait`\n  --> src/auxiliary/trait-debuginfo.rs:23:18"
      1 18 23 "src/auxiliary/trait-debuginfo.rs" info)
+    (rust-panic "thread 'main' (1234) panicked at library/std/src/io/stdio.rs:30:40:"
+                1 40 30 "library/std/src/io/stdio.rs" error)
+    (rust-panic "    thread 'main' (1234) panicked at library/std/src/io/stdio.rs:50:60:"
+                1 60 50 "library/std/src/io/stdio.rs" error)
     ;; ruby (uses gnu)
     (gnu "plain-exception.rb:7:in `fun': unhandled exception"
      1 nil 7 "plain-exception.rb" error)
@@ -552,7 +556,7 @@ The test data is in `compile-tests--test-regexps-data'."
                    1 15 5 "alpha.c")))
         (compile--test-error-line test))
 
-      (should (eq compilation-num-errors-found 108))
+      (should (eq compilation-num-errors-found 110))
       (should (eq compilation-num-warnings-found 37))
       (should (eq compilation-num-infos-found 36)))))