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-rw-r--r--compiler/rustc_borrowck/src/constraints/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_borrowck/src/constraints/mod.rs b/compiler/rustc_borrowck/src/constraints/mod.rs
index 315886bbe29..041ac75ec01 100644
--- a/compiler/rustc_borrowck/src/constraints/mod.rs
+++ b/compiler/rustc_borrowck/src/constraints/mod.rs
@@ -122,6 +122,7 @@ rustc_index::newtype_index! {
 }
 
 rustc_index::newtype_index! {
+    #[orderable]
     #[debug_format = "ConstraintSccIndex({})"]
     pub struct ConstraintSccIndex {}
 }