From f419837b3186c37cf06cba0885a492f29b0a957c Mon Sep 17 00:00:00 2001
From: "Neal H. Walfield" <neal@sequoia-pgp.org>
Date: Fri, 15 Nov 2024 10:58:18 +0100
Subject: [PATCH] Improve the format of error messages for failing examples.

  - Compiler error messages are usually formatted as follows:

    PROGRAM:FILE_NAME:LINENO: MESSAGE

  - When an example fails, format it accordingly.

  - This has the advantage that IDEs like emacs can jump to the
    specified location.
---
 src/cli/examples.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/cli/examples.rs b/src/cli/examples.rs
index 0a53043d..9d446bf5 100644
--- a/src/cli/examples.rs
+++ b/src/cli/examples.rs
@@ -195,7 +195,7 @@ macro_rules! test_examples {
 
             eprintln!("Testing example from {}:{}", file!(), line!());
 
-            for action in $actions.actions {
+            for (i, action) in $actions.actions.into_iter().enumerate() {
                 let command = if let Some(command) = action.command() {
                     command
                 } else {
@@ -222,7 +222,11 @@ macro_rules! test_examples {
 
                     let res = cmd.assert();
                     intermediate = Some(res.get_output().stdout.clone());
-                    res.success();
+                    if let Err(err) = res.try_success() {
+                        eprintln!("example:{}:{}: executing example #{}: {}",
+                                  file!(), line!(), i + 1, err);
+                        panic!("executing example failed");
+                    }
                 }
             }
         }