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-rw-r--r--compiler/rustc_middle/src/traits/select.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/traits/select.rs b/compiler/rustc_middle/src/traits/select.rs
index e836ba47e..53af3e905 100644
--- a/compiler/rustc_middle/src/traits/select.rs
+++ b/compiler/rustc_middle/src/traits/select.rs
@@ -160,6 +160,9 @@ pub enum SelectionCandidate<'tcx> {
/// Implementation of `const Destruct`, optionally from a custom `impl const Drop`.
ConstDestructCandidate(Option<DefId>),
+
+ /// Witnesses the fact that a type is a tuple.
+ TupleCandidate,
}
/// The result of trait evaluation. The order is important