From 5363f350887b1e5b5dd21a86f88c8af9d7fea6da Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:25 +0200
Subject: Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 compiler/rustc_infer/src/infer/sub.rs | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

(limited to 'compiler/rustc_infer/src/infer/sub.rs')

diff --git a/compiler/rustc_infer/src/infer/sub.rs b/compiler/rustc_infer/src/infer/sub.rs
index 97354ba5d..2c6987cc3 100644
--- a/compiler/rustc_infer/src/infer/sub.rs
+++ b/compiler/rustc_infer/src/infer/sub.rs
@@ -6,7 +6,7 @@ use crate::traits::Obligation;
 use rustc_middle::ty::relate::{Cause, Relate, RelateResult, TypeRelation};
 use rustc_middle::ty::visit::TypeVisitable;
 use rustc_middle::ty::TyVar;
-use rustc_middle::ty::{self, ToPredicate, Ty, TyCtxt};
+use rustc_middle::ty::{self, Ty, TyCtxt};
 use std::mem;
 
 /// Ensures `a` is made a subtype of `b`. Returns `a` on success.
@@ -35,6 +35,11 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> {
     fn tag(&self) -> &'static str {
         "Sub"
     }
+
+    fn intercrate(&self) -> bool {
+        self.fields.infcx.intercrate
+    }
+
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.fields.infcx.tcx
     }
@@ -47,6 +52,10 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> {
         self.a_is_expected
     }
 
+    fn mark_ambiguous(&mut self) {
+        self.fields.mark_ambiguous()
+    }
+
     fn with_cause<F, R>(&mut self, cause: Cause, f: F) -> R
     where
         F: FnOnce(&mut Self) -> R,
@@ -95,14 +104,14 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> {
                 // can't make progress on `A <: B` if both A and B are
                 // type variables, so record an obligation.
                 self.fields.obligations.push(Obligation::new(
+                    self.tcx(),
                     self.fields.trace.cause.clone(),
                     self.fields.param_env,
                     ty::Binder::dummy(ty::PredicateKind::Subtype(ty::SubtypePredicate {
                         a_is_expected: self.a_is_expected,
                         a,
                         b,
-                    }))
-                    .to_predicate(self.tcx()),
+                    })),
                 ));
 
                 Ok(a)
@@ -116,9 +125,9 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> {
                 Ok(a)
             }
 
-            (&ty::Error(_), _) | (_, &ty::Error(_)) => {
-                infcx.set_tainted_by_errors();
-                Ok(self.tcx().ty_error())
+            (&ty::Error(e), _) | (_, &ty::Error(e)) => {
+                infcx.set_tainted_by_errors(e);
+                Ok(self.tcx().ty_error_with_guaranteed(e))
             }
 
             (&ty::Opaque(a_def_id, _), &ty::Opaque(b_def_id, _)) if a_def_id == b_def_id => {
-- 
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