Fix obligation param and bless tests

compiler/rustc_trait_selection/src/traits/select/confirmation.rs

@@ -28,7 +28,7 @@ use crate::traits::{
     BuiltinDerivedObligation, ImplDerivedObligation, ImplDerivedObligationCause, ImplSource,
     ImplSourceUserDefinedData, Normalized, Obligation, ObligationCause, PolyTraitObligation,
     PredicateObligation, Selection, SelectionError, SignatureMismatch, TraitNotObjectSafe,
-    Unimplemented,
+    TraitObligation, Unimplemented,
 };
 
 use super::BuiltinImplConditions;
@@ -693,12 +693,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         )
         .map_bound(|(trait_ref, _)| trait_ref);
 
-        let mut nested = self.equate_trait_refs(
+        let mut nested =
-            &obligation.cause,
+            self.equate_trait_refs(obligation.with(tcx, placeholder_predicate), trait_ref)?;
-            obligation.param_env,
-            placeholder_predicate.trait_ref,
-            trait_ref,
-        )?;
         let cause = obligation.derived_cause(BuiltinDerivedObligation);
 
         // Confirm the `type Output: Sized;` bound that is present on `FnOnce`
@@ -764,9 +760,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         );
 
         let nested = self.equate_trait_refs(
-            &obligation.cause,
+            obligation.with(self.tcx(), placeholder_predicate),
-            obligation.param_env,
-            placeholder_predicate.trait_ref,
             ty::Binder::dummy(trait_ref),
         )?;
         debug!(?trait_ref, ?nested, "coroutine candidate obligations");
@@ -796,9 +790,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         );
 
         let nested = self.equate_trait_refs(
-            &obligation.cause,
+            obligation.with(self.tcx(), placeholder_predicate),
-            obligation.param_env,
-            placeholder_predicate.trait_ref,
             ty::Binder::dummy(trait_ref),
         )?;
         debug!(?trait_ref, ?nested, "future candidate obligations");
@@ -828,9 +820,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         );
 
         let nested = self.equate_trait_refs(
-            &obligation.cause,
+            obligation.with(self.tcx(), placeholder_predicate),
-            obligation.param_env,
-            placeholder_predicate.trait_ref,
             ty::Binder::dummy(trait_ref),
         )?;
         debug!(?trait_ref, ?nested, "iterator candidate obligations");
@@ -860,9 +850,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         );
 
         let nested = self.equate_trait_refs(
-            &obligation.cause,
+            obligation.with(self.tcx(), placeholder_predicate),
-            obligation.param_env,
-            placeholder_predicate.trait_ref,
             ty::Binder::dummy(trait_ref),
         )?;
         debug!(?trait_ref, ?nested, "iterator candidate obligations");
@@ -898,12 +886,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             }
         };
 
-        self.equate_trait_refs(
+        self.equate_trait_refs(obligation.with(self.tcx(), placeholder_predicate), trait_ref)
-            &obligation.cause,
-            obligation.param_env,
-            placeholder_predicate.trait_ref,
-            trait_ref,
-        )
     }
 
     #[instrument(skip(self), level = "debug")]
@@ -981,12 +964,9 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             _ => bug!("expected callable type for AsyncFn candidate"),
         };
 
-        nested.extend(self.equate_trait_refs(
+        nested.extend(
-            &obligation.cause,
+            self.equate_trait_refs(obligation.with(tcx, placeholder_predicate), trait_ref)?,
-            obligation.param_env,
+        );
-            placeholder_predicate.trait_ref,
-            trait_ref,
-        )?);
 
         let goal_kind =
             self.tcx().async_fn_trait_kind_from_def_id(obligation.predicate.def_id()).unwrap();
@@ -1041,13 +1021,11 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     #[instrument(skip(self), level = "trace")]
     fn equate_trait_refs(
         &mut self,
-        cause: &ObligationCause<'tcx>,
+        obligation: TraitObligation<'tcx>,
-        param_env: ty::ParamEnv<'tcx>,
-        obligation_trait_ref: ty::TraitRef<'tcx>,
         found_trait_ref: ty::PolyTraitRef<'tcx>,
     ) -> Result<Vec<PredicateObligation<'tcx>>, SelectionError<'tcx>> {
         let found_trait_ref = self.infcx.instantiate_binder_with_fresh_vars(
-            cause.span,
+            obligation.cause.span,
             HigherRankedType,
             found_trait_ref,
         );
@@ -1056,16 +1034,16 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             ensure_sufficient_stack(|| {
                 normalize_with_depth(
                     self,
-                    param_env,
+                    obligation.param_env,
-                    cause.clone(),
+                    obligation.cause.clone(),
-                    0,
+                    obligation.recursion_depth + 1,
-                    (obligation_trait_ref, found_trait_ref),
+                    (obligation.predicate.trait_ref, found_trait_ref),
                 )
             });
 
         // needed to define opaque types for tests/ui/type-alias-impl-trait/assoc-projection-ice.rs
         self.infcx
-            .at(&cause, param_env)
+            .at(&obligation.cause, obligation.param_env)
             .eq(DefineOpaqueTypes::Yes, obligation_trait_ref, found_trait_ref)
             .map(|InferOk { mut obligations, .. }| {
                 obligations.extend(nested);

tests/ui/higher-ranked/builtin-closure-like-bounds.rs

@@ -2,6 +2,13 @@
 //@ compile-flags: -Zunstable-options
 //@ revisions: current next
 //@[next] compile-flags: -Znext-solver
+//@ check-pass
+
+// Makes sure that we support closure/coroutine goals where the signature of
+// the item references higher-ranked lifetimes from the *predicate* binder,
+// not its own internal signature binder.
+//
+// This was fixed in <https://github.com/rust-lang/rust/pull/122267>.
 
 #![feature(unboxed_closures, gen_blocks)]
 
@@ -48,4 +55,4 @@ fn main() {
 
     fn uwu<'a>(x: &'a ()) -> impl Fn(&'a ()) { |_| {} }
     Closure(uwu).dispatch();
-}
+}

tests/ui/higher-ranked/closure-bound-codegen-ice.rs

@@ -0,0 +1,33 @@
+//@ revisions: current next
+//@[next] compile-flags: -Znext-solver
+//@ build-pass
+
+// Regression test for incomplete handling of Fn-trait goals,
+// fixed in #122267.
+
+trait Trait {
+    type Assoc<'a>: FnOnce(&'a ());
+}
+
+impl Trait for () {
+    type Assoc<'a> = fn(&'a ());
+}
+
+trait Indir {
+    fn break_me() {}
+}
+
+impl<F: Trait> Indir for F
+where
+    for<'a> F::Assoc<'a>: FnOnce(&'a ()),
+{
+    fn break_me() {}
+}
+
+fn foo<F: Trait>() {
+    F::break_me()
+}
+
+fn main() {
+    foo::<()>();
+}

tests/ui/higher-ranked/trait-bounds/fn-ptr.classic.stderr

@@ -1,19 +0,0 @@
-error[E0277]: expected a `Fn(&'w ())` closure, found `fn(&'w ())`
-  --> $DIR/fn-ptr.rs:12:5
-   |
-LL |     ice();
-   |     ^^^^^ expected an `Fn(&'w ())` closure, found `fn(&'w ())`
-   |
-   = help: the trait `for<'w> Fn<(&'w (),)>` is not implemented for `fn(&'w ())`
-note: required by a bound in `ice`
-  --> $DIR/fn-ptr.rs:7:25
-   |
-LL | fn ice()
-   |    --- required by a bound in this function
-LL | where
-LL |     for<'w> fn(&'w ()): Fn(&'w ()),
-   |                         ^^^^^^^^^^ required by this bound in `ice`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.

tests/ui/higher-ranked/trait-bounds/fn-ptr.current.stderr

@@ -1,19 +0,0 @@
-error[E0277]: expected a `Fn(&'w ())` closure, found `fn(&'w ())`
-  --> $DIR/fn-ptr.rs:13:5
-   |
-LL |     ice();
-   |     ^^^^^ expected an `Fn(&'w ())` closure, found `fn(&'w ())`
-   |
-   = help: the trait `for<'w> Fn<(&'w (),)>` is not implemented for `fn(&'w ())`
-note: required by a bound in `ice`
-  --> $DIR/fn-ptr.rs:8:25
-   |
-LL | fn ice()
-   |    --- required by a bound in this function
-LL | where
-LL |     for<'w> fn(&'w ()): Fn(&'w ()),
-   |                         ^^^^^^^^^^ required by this bound in `ice`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0277`.

tests/ui/higher-ranked/trait-bounds/fn-ptr.rs

@@ -1,7 +1,7 @@
 //@ revisions: current next
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@[next] compile-flags: -Znext-solver
-//@[next] check-pass
+//@ check-pass
 
 fn ice()
 where
@@ -11,5 +11,4 @@ where
 
 fn main() {
     ice();
-    //[current]~^ ERROR expected a `Fn(&'w ())` closure, found `fn(&'w ())`
 }

tests/ui/higher-ranked/trait-bounds/future.classic.stderr

@@ -1,6 +0,0 @@
-error: the compiler unexpectedly panicked. this is a bug.
-
-query stack during panic:
-#0 [evaluate_obligation] evaluating trait selection obligation `for<'a> {async fn body@$DIR/future.rs:32:35: 34:2}: core::future::future::Future`
-#1 [codegen_select_candidate] computing candidate for `<strlen as Trait>`
-end of query stack

tests/ui/higher-ranked/trait-bounds/future.current.stderr

@@ -1,6 +0,0 @@
-error: the compiler unexpectedly panicked. this is a bug.
-
-query stack during panic:
-#0 [evaluate_obligation] evaluating trait selection obligation `for<'a> {async fn body of strlen()}: core::future::future::Future`
-#1 [codegen_select_candidate] computing candidate for `<strlen as Trait>`
-end of query stack

tests/ui/higher-ranked/trait-bounds/future.rs

@@ -3,14 +3,7 @@
 //@ revisions: current next
 //@ ignore-compare-mode-next-solver (explicit revisions)
 //@[next] compile-flags: -Znext-solver
-//@[next] check-pass
+//@ check-pass
-//@[current] known-bug: #112347
-//@[current] build-fail
-//@[current] failure-status: 101
-//@[current] normalize-stderr-test "note: .*\n\n" -> ""
-//@[current] normalize-stderr-test "thread 'rustc' panicked.*\n.*\n" -> ""
-//@[current] normalize-stderr-test "(error: internal compiler error: [^:]+):\d+:\d+: " -> "$1:LL:CC: "
-//@[current] rustc-env:RUST_BACKTRACE=0
 
 #![feature(unboxed_closures)]
 

tests/ui/lifetimes/issue-105675.rs

@@ -4,7 +4,7 @@ fn main() {
     let f = | _ , y: &u32 , z | ();
     thing(f);
     //~^ ERROR implementation of `FnOnce` is not general enough
-    //~^^ ERROR implementation of `FnOnce` is not general enough
+    //~| ERROR implementation of `FnOnce` is not general enough
     let f = | x, y: _  , z: u32 | ();
     thing(f);
     //~^ ERROR implementation of `FnOnce` is not general enough

tests/ui/lifetimes/lifetime-errors/issue_74400.rs

@@ -1,5 +1,5 @@
 //! Regression test for #74400: Type mismatch in function arguments E0631, E0271 are falsely
-//! recognized as E0308 mismatched types.
+//! recognized as "implementation of `FnOnce` is not general enough".
 
 use std::convert::identity;
 
@@ -13,6 +13,6 @@ fn g<T>(data: &[T]) {
     //~^ ERROR the parameter type
     //~| ERROR the parameter type
     //~| ERROR the parameter type
-    //~| ERROR implementation of `FnOnce` is not general
+    //~| ERROR implementation of `FnOnce` is not general enough
     //~| ERROR implementation of `Fn` is not general enough
 }