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-rw-r--r--src/libsyntax/sess.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libsyntax/sess.rs b/src/libsyntax/sess.rs
index ac6be3036ce..febaa714775 100644
--- a/src/libsyntax/sess.rs
+++ b/src/libsyntax/sess.rs
@@ -48,6 +48,8 @@ crate struct GatedSpans {
     pub try_blocks: Lock<Vec<Span>>,
     /// Spans collected for gating `label_break_value`, e.g. `'label: { ... }`.
     pub label_break_value: Lock<Vec<Span>>,
+    /// Spans collected for gating `box_syntax`, e.g. `box $expr`.
+    pub box_syntax: Lock<Vec<Span>>,
 }
 
 /// Info about a parsing session.