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-rw-r--r--compiler/rustc_middle/src/traits/select.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/traits/select.rs b/compiler/rustc_middle/src/traits/select.rs
index a90d58f5fc1..ffae3579889 100644
--- a/compiler/rustc_middle/src/traits/select.rs
+++ b/compiler/rustc_middle/src/traits/select.rs
@@ -127,6 +127,7 @@ pub enum SelectionCandidate<'tcx> {
     /// an applicable bound in the trait definition. The `usize` is an index
     /// into the list returned by `tcx.item_bounds`. The constness is the
     /// constness of the bound in the trait.
+    // FIXME(effects) do we need this constness
     ProjectionCandidate(usize, ty::BoundConstness),
 
     /// Implementation of a `Fn`-family trait by one of the anonymous types