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-rw-r--r--compiler/rustc_pattern_analysis/src/constructor.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_pattern_analysis/src/constructor.rs b/compiler/rustc_pattern_analysis/src/constructor.rs
index d7e216ddbc5..a3af4eb6d21 100644
--- a/compiler/rustc_pattern_analysis/src/constructor.rs
+++ b/compiler/rustc_pattern_analysis/src/constructor.rs
@@ -266,6 +266,7 @@ pub struct IntRange {
 
 impl IntRange {
     /// Best effort; will not know that e.g. `255u8..` is a singleton.
+    #[cfg_attr(not(feature = "rustc"), allow(dead_code))]
     pub(crate) fn is_singleton(&self) -> bool {
         // Since `lo` and `hi` can't be the same `Infinity` and `plus_one` never changes from finite
         // to infinite, this correctly only detects ranges that contain exacly one `Finite(x)`.