remove unused incorrect `EqUnifyValue` impl

diff --git a/compiler/rustc_middle/src/infer/unify_key.rs b/compiler/rustc_middle/src/infer/unify_key.rs
index 7859922d503473f41b913a5fa65211d6338ebdcc..f2627885d030dc5db0eaf680042dcaf5f8c97bc1 100644 (file)
--- a/compiler/rustc_middle/src/infer/unify_key.rs
+++ b/compiler/rustc_middle/src/infer/unify_key.rs
@@ -1,5 +1,5 @@
 use crate::ty::{self, Ty, TyCtxt};
-use rustc_data_structures::unify::{EqUnifyValue, NoError, UnifyKey, UnifyValue};
+use rustc_data_structures::unify::{NoError, UnifyKey, UnifyValue};
 use rustc_span::def_id::DefId;
 use rustc_span::symbol::Symbol;
 use rustc_span::Span;
@@ -160,5 +160,3 @@ fn unify_values(&value1: &Self, &value2: &Self) -> Result<Self, Self::Error> {
         })
     }
 }
-
-impl<'tcx> EqUnifyValue for ty::Const<'tcx> {}