Built-in implementation of Tuple trait

[rust.git] / compiler / rustc_middle / src / traits / select.rs

diff --git a/compiler/rustc_middle/src/traits/select.rs b/compiler/rustc_middle/src/traits/select.rs
index e836ba47eed7a31fab3bbbe1eae5bf7fd92869a1..53af3e905341960e528da3528de1c91336cee72c 100644 (file)
--- 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