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-rw-r--r--src/librustc_errors/emitter.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustc_errors/emitter.rs b/src/librustc_errors/emitter.rs
index 6c47c01d0fb..893f8a6e4dd 100644
--- a/src/librustc_errors/emitter.rs
+++ b/src/librustc_errors/emitter.rs
@@ -33,6 +33,7 @@ pub trait Emitter {
 
 impl Emitter for EmitterWriter {
     fn emit(&mut self, db: &DiagnosticBuilder) {
+        // Pick old school mode either from env or let the test dictate the format
         let old_school = match self.format_mode {
             FormatMode::NewErrorFormat => false,
             FormatMode::OriginalErrorFormat => true,