New upstream version 1.57.0+dfsg1

[rustc.git] / compiler / rustc_trait_selection / src / autoderef.rs

diff --git a/compiler/rustc_trait_selection/src/autoderef.rs b/compiler/rustc_trait_selection/src/autoderef.rs
index 969962e55b0df3e4fb963572e1e3e8b06b321da2..53afe4ca068c4cf24f0601ee3c38ddb7a8cbc855 100644 (file)
--- a/compiler/rustc_trait_selection/src/autoderef.rs
+++ b/compiler/rustc_trait_selection/src/autoderef.rs
@@ -5,7 +5,7 @@ use rustc_hir as hir;
 use rustc_infer::infer::InferCtxt;
 use rustc_middle::ty::{self, TraitRef, Ty, TyCtxt, WithConstness};
 use rustc_middle::ty::{ToPredicate, TypeFoldable};
-use rustc_session::DiagnosticMessageId;
+use rustc_session::{DiagnosticMessageId, Limit};
 use rustc_span::def_id::LOCAL_CRATE;
 use rustc_span::Span;
 
@@ -135,7 +135,7 @@ impl<'a, 'tcx> Autoderef<'a, 'tcx> {
         let obligation = traits::Obligation::new(
             cause.clone(),
             self.param_env,
-            trait_ref.without_const().to_predicate(tcx),
+            ty::Binder::dummy(trait_ref).without_const().to_predicate(tcx),
         );
         if !self.infcx.predicate_may_hold(&obligation) {
             debug!("overloaded_deref_ty: cannot match obligation");
@@ -217,7 +217,10 @@ impl<'a, 'tcx> Autoderef<'a, 'tcx> {
 
 pub fn report_autoderef_recursion_limit_error<'tcx>(tcx: TyCtxt<'tcx>, span: Span, ty: Ty<'tcx>) {
     // We've reached the recursion limit, error gracefully.
-    let suggested_limit = tcx.recursion_limit() * 2;
+    let suggested_limit = match tcx.recursion_limit() {
+        Limit(0) => Limit(2),
+        limit => limit * 2,
+    };
     let msg = format!("reached the recursion limit while auto-dereferencing `{:?}`", ty);
     let error_id = (DiagnosticMessageId::ErrorId(55), Some(span), msg);
     let fresh = tcx.sess.one_time_diagnostics.borrow_mut().insert(error_id);
@@ -231,7 +234,8 @@ pub fn report_autoderef_recursion_limit_error<'tcx>(tcx: TyCtxt<'tcx>, span: Spa
         )
         .span_label(span, "deref recursion limit reached")
         .help(&format!(
-            "consider adding a `#![recursion_limit=\"{}\"]` attribute to your crate (`{}`)",
+            "consider increasing the recursion limit by adding a \
+             `#![recursion_limit = \"{}\"]` attribute to your crate (`{}`)",
             suggested_limit,
             tcx.crate_name(LOCAL_CRATE),
         ))