From c259c4048a97329a70a7ec2dcd0e79fe2c36be68 Mon Sep 17 00:00:00 2001
From: Sasha Pourcelot <sasha.pourcelot@protonmail.com>
Date: Sat, 14 Feb 2026 19:52:42 +0000
Subject: [PATCH] compiletest: normalize stderr before SVG rendering

Element position is hardcoded in the rendered SVG. This means that any
change in element length (for instance, when substituting the path with
the `rust` checkout with `$DIR`) would not change the position and result
in buggy SVG being generated. Normalizing before SVG rendering allows us
to keep a consistent element placement.
---
 src/tools/compiletest/src/runtest.rs | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index e6eb1f3bd957..99c51207f601 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2379,15 +2379,22 @@ impl<'test> TestCx<'test> {
             _ => {}
         };
 
-        let stderr = if self.force_color_svg() {
-            anstyle_svg::Term::new().render_svg(&proc_res.stderr)
-        } else if explicit_format {
-            proc_res.stderr.clone()
-        } else {
-            json::extract_rendered(&proc_res.stderr)
-        };
+        let stderr;
+        let normalized_stderr;
+
+        if self.force_color_svg() {
+            let normalized = self.normalize_output(&proc_res.stderr, &self.props.normalize_stderr);
+            stderr = anstyle_svg::Term::new().render_svg(&normalized);
+            normalized_stderr = stderr.clone();
+        } else {
+            stderr = if explicit_format {
+                proc_res.stderr.clone()
+            } else {
+                json::extract_rendered(&proc_res.stderr)
+            };
+            normalized_stderr = self.normalize_output(&stderr, &self.props.normalize_stderr);
+        }
 
-        let normalized_stderr = self.normalize_output(&stderr, &self.props.normalize_stderr);
         let mut errors = 0;
         match output_kind {
             TestOutput::Compile => {