X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_infer%2Fsrc%2Finfer%2Fcombine.rs;h=cf895ed0d3e598ba23eb5effcb52345e75982045;hb=d1449560e31f7f801d81268a3dad783181656dff;hp=c2552561c42dfda9f7f99c54da006ad3457a5eb4;hpb=20d6a44334e189989a99f2f914b243dd81e88968;p=rust.git

diff --git a/compiler/rustc_infer/src/infer/combine.rs b/compiler/rustc_infer/src/infer/combine.rs
index c2552561c42..cf895ed0d3e 100644
--- a/compiler/rustc_infer/src/infer/combine.rs
+++ b/compiler/rustc_infer/src/infer/combine.rs
@@ -450,6 +450,15 @@ pub fn add_const_equate_obligation(
             ty::Binder::dummy(predicate),
         ));
     }
+
+    pub fn mark_ambiguous(&mut self) {
+        self.obligations.push(Obligation::new(
+            self.tcx(),
+            self.trace.cause.clone(),
+            self.param_env,
+            ty::Binder::dummy(ty::PredicateKind::Ambiguous),
+        ));
+    }
 }
 
 struct Generalizer<'cx, 'tcx> {
@@ -521,6 +530,11 @@ impl<'tcx> TypeRelation<'tcx> for Generalizer<'_, 'tcx> {
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
+
+    fn intercrate(&self) -> bool {
+        self.infcx.intercrate
+    }
+
     fn param_env(&self) -> ty::ParamEnv<'tcx> {
         self.param_env
     }
@@ -533,6 +547,10 @@ fn a_is_expected(&self) -> bool {
         true
     }
 
+    fn mark_ambiguous(&mut self) {
+        span_bug!(self.cause.span, "opaque types are handled in `tys`");
+    }
+
     fn binders<T>(
         &mut self,
         a: ty::Binder<'tcx, T>,
@@ -657,6 +675,10 @@ fn tys(&mut self, t: Ty<'tcx>, t2: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
                 // relatable.
                 Ok(t)
             }
+            ty::Opaque(def_id, substs) => {
+                let s = self.relate(substs, substs)?;
+                Ok(if s == substs { t } else { self.infcx.tcx.mk_opaque(def_id, s) })
+            }
             _ => relate::super_relate_tys(self, t, t),
         }?;
 
@@ -731,7 +753,7 @@ fn consts(
                                 origin: var_value.origin,
                                 val: ConstVariableValue::Unknown { universe: self.for_universe },
                             });
-                            Ok(self.tcx().mk_const_var(new_var_id, c.ty()))
+                            Ok(self.tcx().mk_const(new_var_id, c.ty()))
                         }
                     }
                 }
@@ -743,10 +765,7 @@ fn consts(
                     substs,
                     substs,
                 )?;
-                Ok(self.tcx().mk_const(
-                    ty::ConstKind::Unevaluated(ty::UnevaluatedConst { def, substs }),
-                    c.ty(),
-                ))
+                Ok(self.tcx().mk_const(ty::UnevaluatedConst { def, substs }, c.ty()))
             }
             _ => relate::super_relate_consts(self, c, c),
         }
@@ -799,6 +818,11 @@ fn tcx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
 
+    fn intercrate(&self) -> bool {
+        assert!(!self.infcx.intercrate);
+        false
+    }
+
     fn param_env(&self) -> ty::ParamEnv<'tcx> {
         self.param_env
     }
@@ -811,6 +835,10 @@ fn a_is_expected(&self) -> bool {
         true
     }
 
+    fn mark_ambiguous(&mut self) {
+        bug!()
+    }
+
     fn relate_with_variance<T: Relate<'tcx>>(
         &mut self,
         _variance: ty::Variance,
@@ -944,7 +972,7 @@ fn consts(
                                         },
                                     },
                                 );
-                            Ok(self.tcx().mk_const_var(new_var_id, c.ty()))
+                            Ok(self.tcx().mk_const(new_var_id, c.ty()))
                         }
                     }
                 }
@@ -957,10 +985,7 @@ fn consts(
                     substs,
                 )?;
 
-                Ok(self.tcx().mk_const(
-                    ty::ConstKind::Unevaluated(ty::UnevaluatedConst { def, substs }),
-                    c.ty(),
-                ))
+                Ok(self.tcx().mk_const(ty::UnevaluatedConst { def, substs }, c.ty()))
             }
             _ => relate::super_relate_consts(self, c, c),
         }