add predicate evaluation logic

2023-02-17 09:32:33 +00:00 · 2023-02-17 09:32:33 +00:00 · 90c8d6bbe4
commit 90c8d6bbe4
parent e919d7e348
9 changed files with 124 additions and 18 deletions
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@ -993,8 +993,14 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                    bug!("AliasEq is only used for new solver")
                }
                ty::PredicateKind::Ambiguous => Ok(EvaluatedToAmbig),
-                ty::PredicateKind::Clause(ty::Clause::ConstArgHasType(..)) => {
-                    unimplemented!()
+                ty::PredicateKind::Clause(ty::Clause::ConstArgHasType(ct, ty)) => {
+                    match self.infcx.at(&obligation.cause, obligation.param_env).eq(ct.ty(), ty) {
+                        Ok(inf_ok) => self.evaluate_predicates_recursively(
+                            previous_stack,
+                            inf_ok.into_obligations(),
+                        ),
+                        Err(_) => Ok(EvaluatedToErr),
+                    }
                }
            }
        })