Treat str as containing [u8] for auto trait purposes

2023-02-11 23:01:22 +00:00
parent 31448badfd
commit 3560e65c44
4 changed files with 35 additions and 2 deletions
--- a/compiler/rustc_trait_selection/src/traits/select/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs
@@ -2300,12 +2300,14 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
            | ty::Float(_)
            | ty::FnDef(..)
            | ty::FnPtr(_)
-            | ty::Str
            | ty::Error(_)
            | ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
            | ty::Never
            | ty::Char => ty::Binder::dummy(Vec::new()),

+            // Treat this like `struct str([u8]);`
+            ty::Str => ty::Binder::dummy(vec![self.tcx().mk_slice(self.tcx().types.u8)]),
+
            ty::Placeholder(..)
            | ty::Dynamic(..)
            | ty::Param(..)