1 files changed, 31 insertions, 7 deletions
diff --git a/compiler/rustc_middle/src/traits/mod.rs b/compiler/rustc_middle/src/traits/mod.rs
index 6231dd9b6..91f07389f 100644
--- a/compiler/rustc_middle/src/traits/mod.rs
+++ b/compiler/rustc_middle/src/traits/mod.rs
@@ -305,8 +305,6 @@ pub enum ObligationCauseCode<'tcx> {
     SizedReturnType,
     /// Yield type must be `Sized`.
     SizedYieldType,
-    /// Box expression result type must be `Sized`.
-    SizedBoxType,
     /// Inline asm operand type must be `Sized`.
     InlineAsmSized,
     /// `[expr; N]` requires `type_of(expr): Copy`.
@@ -699,9 +697,9 @@ impl<'tcx, N> ImplSource<'tcx, N> {
     }
 
     pub fn borrow_nested_obligations(&self) -> &[N] {
-        match &self {
-            ImplSource::UserDefined(i) => &i.nested[..],
-            ImplSource::Param(n, _) => &n,
+        match self {
+            ImplSource::UserDefined(i) => &i.nested,
+            ImplSource::Param(n, _) => n,
             ImplSource::Builtin(i) => &i.nested,
             ImplSource::AutoImpl(d) => &d.nested,
             ImplSource::Closure(c) => &c.nested,
@@ -715,6 +713,23 @@ impl<'tcx, N> ImplSource<'tcx, N> {
         }
     }
 
+    pub fn borrow_nested_obligations_mut(&mut self) -> &mut [N] {
+        match self {
+            ImplSource::UserDefined(i) => &mut i.nested,
+            ImplSource::Param(n, _) => n,
+            ImplSource::Builtin(i) => &mut i.nested,
+            ImplSource::AutoImpl(d) => &mut d.nested,
+            ImplSource::Closure(c) => &mut c.nested,
+            ImplSource::Generator(c) => &mut c.nested,
+            ImplSource::Future(c) => &mut c.nested,
+            ImplSource::Object(d) => &mut d.nested,
+            ImplSource::FnPointer(d) => &mut d.nested,
+            ImplSource::TraitAlias(d) => &mut d.nested,
+            ImplSource::TraitUpcasting(d) => &mut d.nested,
+            ImplSource::ConstDestruct(i) => &mut i.nested,
+        }
+    }
+
     pub fn map<M, F>(self, f: F) -> ImplSource<'tcx, M>
     where
         F: FnMut(N) -> M,
@@ -899,6 +914,9 @@ pub enum ObjectSafetyViolation {
     /// (e.g., `trait Foo : Bar<Self>`).
     SupertraitSelf(SmallVec<[Span; 1]>),
 
+    // Supertrait has a non-lifetime `for<T>` binder.
+    SupertraitNonLifetimeBinder(SmallVec<[Span; 1]>),
+
     /// Method has something illegal.
     Method(Symbol, MethodViolationCode, Span),
 
@@ -921,6 +939,9 @@ impl ObjectSafetyViolation {
                         .into()
                 }
             }
+            ObjectSafetyViolation::SupertraitNonLifetimeBinder(_) => {
+                "where clause cannot reference non-lifetime `for<...>` variables".into()
+            }
             ObjectSafetyViolation::Method(name, MethodViolationCode::StaticMethod(_), _) => {
                 format!("associated function `{}` has no `self` parameter", name).into()
             }
@@ -971,7 +992,9 @@ impl ObjectSafetyViolation {
 
     pub fn solution(&self, err: &mut Diagnostic) {
         match self {
-            ObjectSafetyViolation::SizedSelf(_) | ObjectSafetyViolation::SupertraitSelf(_) => {}
+            ObjectSafetyViolation::SizedSelf(_)
+            | ObjectSafetyViolation::SupertraitSelf(_)
+            | ObjectSafetyViolation::SupertraitNonLifetimeBinder(..) => {}
             ObjectSafetyViolation::Method(
                 name,
                 MethodViolationCode::StaticMethod(Some((add_self_sugg, make_sized_sugg))),
@@ -1025,7 +1048,8 @@ impl ObjectSafetyViolation {
         // diagnostics use a `note` instead of a `span_label`.
         match self {
             ObjectSafetyViolation::SupertraitSelf(spans)
-            | ObjectSafetyViolation::SizedSelf(spans) => spans.clone(),
+            | ObjectSafetyViolation::SizedSelf(spans)
+            | ObjectSafetyViolation::SupertraitNonLifetimeBinder(spans) => spans.clone(),
             ObjectSafetyViolation::AssocConst(_, span)
             | ObjectSafetyViolation::GAT(_, span)
             | ObjectSafetyViolation::Method(_, _, span)