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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 666e5d402ef..492620d45bf 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1166,6 +1166,7 @@ impl<'test> TestCx<'test> {
                 .arg(&lldb_script_path)
                 .arg(test_executable)
                 .arg(debugger_script)
+                .env("PYTHONUNBUFFERED", "1") // Help debugging #78665
                 .env("PYTHONPATH", self.config.lldb_python_dir.as_ref().unwrap()),
         )
     }