Fix diagnostics for unfulfilled obligations

2022-07-26 13:57:19 +00:00
parent d60ebe366b
commit 71e162e6ca
5 changed files with 20 additions and 26 deletions
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -829,6 +829,14 @@ impl<'tcx> TraitPredicate<'tcx> {
    pub fn is_const_if_const(self) -> bool {
        self.constness == BoundConstness::ConstIfConst
    }
+
+    pub fn is_constness_satisfied_by(self, constness: hir::Constness) -> bool {
+        match (self.constness, constness) {
+            (BoundConstness::NotConst, _)
+            | (BoundConstness::ConstIfConst, hir::Constness::Const) => true,
+            (BoundConstness::ConstIfConst, hir::Constness::NotConst) => false,
+        }
+    }
 }

 impl<'tcx> PolyTraitPredicate<'tcx> {