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-rw-r--r--src/tools/compiletest/src/runtest.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 26730fcec4c..d3e5a2dd644 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1960,6 +1960,7 @@ impl<'test> TestCx<'test> {
                     "-Zdump-mir=all",
                     "-Zvalidate-mir",
                     "-Zdump-mir-exclude-pass-number",
+                    "-Zmir-pretty-relative-line-numbers=yes",
                 ]);
                 if let Some(pass) = &self.props.mir_unit_test {
                     rustc.args(&["-Zmir-opt-level=0", &format!("-Zmir-enable-passes=+{}", pass)]);