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-rw-r--r--src/libsyntax/json.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/libsyntax/json.rs b/src/libsyntax/json.rs
index ec0222d90eb..83c9c692bd3 100644
--- a/src/libsyntax/json.rs
+++ b/src/libsyntax/json.rs
@@ -122,7 +122,6 @@ struct Diagnostic {
 }
 
 #[derive(RustcEncodable)]
-#[allow(unused_attributes)]
 struct DiagnosticSpan {
     file_name: String,
     byte_start: u32,