more span info

compiler/rustc_middle/src/ty/mod.rs

@@ -238,7 +238,7 @@ pub struct ImplHeader<'tcx> {
     pub impl_def_id: DefId,
     pub self_ty: Ty<'tcx>,
     pub trait_ref: Option<TraitRef<'tcx>>,
-    pub predicates: Vec<Predicate<'tcx>>,
+    pub predicates: Vec<(Predicate<'tcx>, Span)>,
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug, TypeFoldable, TypeVisitable)]

compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -151,14 +151,16 @@ fn with_fresh_ty_vars<'cx, 'tcx>(
             .predicates_of(impl_def_id)
             .instantiate(tcx, impl_args)
             .iter()
-            .map(|(c, _)| c.as_predicate())
+            .map(|(c, s)| (c.as_predicate(), s))
             .collect(),
     };
 
-    let InferOk { value: mut header, obligations } =
-        selcx.infcx.at(&ObligationCause::dummy(), param_env).normalize(header);
+    let InferOk { value: mut header, obligations } = selcx
+        .infcx
+        .at(&ObligationCause::dummy_with_span(tcx.def_span(impl_def_id)), param_env)
+        .normalize(header);
 
-    header.predicates.extend(obligations.into_iter().map(|o| o.predicate));
+    header.predicates.extend(obligations.into_iter().map(|o| (o.predicate, o.cause.span)));
     header
 }
 
@@ -289,7 +291,7 @@ fn impl_intersection_has_impossible_obligation<'cx, 'tcx>(
 ) -> bool {
     let infcx = selcx.infcx;
 
-    let obligation_guaranteed_to_fail = move |obligation: &PredicateObligation<'tcx>| {
+    let obligation_guaranteed_to_fail = |obligation: &PredicateObligation<'tcx>| {
         if infcx.next_trait_solver() {
             infcx.evaluate_obligation(obligation).map_or(false, |result| !result.may_apply())
         } else {
@@ -306,8 +308,8 @@ fn impl_intersection_has_impossible_obligation<'cx, 'tcx>(
     let opt_failing_obligation = [&impl1_header.predicates, &impl2_header.predicates]
         .into_iter()
         .flatten()
-        .map(|&predicate| {
-            Obligation::new(infcx.tcx, ObligationCause::dummy(), param_env, predicate)
+        .map(|&(predicate, span)| {
+            Obligation::new(infcx.tcx, ObligationCause::dummy_with_span(span), param_env, predicate)
         })
         .chain(obligations)
         .find(obligation_guaranteed_to_fail);

tests/ui/traits/issue-105231.rs

@@ -1,9 +1,9 @@
-//~ ERROR overflow evaluating the requirement `A<A<A<A<A<A<A<...>>>>>>>: Send`
 struct A<T>(B<T>);
 //~^ ERROR recursive types `A` and `B` have infinite size
 struct B<T>(A<A<T>>);
 trait Foo {}
 impl<T> Foo for T where T: Send {}
+//~^ ERROR overflow evaluating the requirement `A<A<A<A<A<A<A<...>>>>>>>: Send`
 impl Foo for B<u8> {}
 
 fn main() {}

tests/ui/traits/issue-105231.stderr

@@ -1,5 +1,5 @@
 error[E0072]: recursive types `A` and `B` have infinite size
-  --> $DIR/issue-105231.rs:2:1
+  --> $DIR/issue-105231.rs:1:1
    |
 LL | struct A<T>(B<T>);
    | ^^^^^^^^^^^ ---- recursive without indirection
@@ -15,10 +15,14 @@ LL ~ struct B<T>(Box<A<A<T>>>);
    |
 
 error[E0275]: overflow evaluating the requirement `A<A<A<A<A<A<A<...>>>>>>>: Send`
+  --> $DIR/issue-105231.rs:5:28
+   |
+LL | impl<T> Foo for T where T: Send {}
+   |                            ^^^^
    |
    = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`issue_105231`)
 note: required because it appears within the type `B<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<A<u8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
-  --> $DIR/issue-105231.rs:4:8
+  --> $DIR/issue-105231.rs:3:8
    |
 LL | struct B<T>(A<A<T>>);
    |        ^

tests/ui/traits/solver-cycles/cycle-via-builtin-auto-trait-impl.rs

@@ -1,4 +1,3 @@
-//~ ERROR overflow
 // A regression test for #111729 checking that we correctly
 // track recursion depth for obligations returned by confirmation.
 use std::panic::RefUnwindSafe;
@@ -15,6 +14,7 @@ struct RootDatabase {
 }
 
 impl<T: RefUnwindSafe> Database for T {
+    //~^ ERROR overflow
     type Storage = SalsaStorage;
 }
 impl Database for RootDatabase {

tests/ui/traits/solver-cycles/cycle-via-builtin-auto-trait-impl.stderr

@@ -1,13 +1,17 @@
 error[E0275]: overflow evaluating the requirement `Runtime<RootDatabase>: RefUnwindSafe`
+  --> $DIR/cycle-via-builtin-auto-trait-impl.rs:16:9
+   |
+LL | impl<T: RefUnwindSafe> Database for T {
+   |         ^^^^^^^^^^^^^
    |
    = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`cycle_via_builtin_auto_trait_impl`)
 note: required because it appears within the type `RootDatabase`
-  --> $DIR/cycle-via-builtin-auto-trait-impl.rs:13:8
+  --> $DIR/cycle-via-builtin-auto-trait-impl.rs:12:8
    |
 LL | struct RootDatabase {
    |        ^^^^^^^^^^^^
 note: required for `RootDatabase` to implement `Database`
-  --> $DIR/cycle-via-builtin-auto-trait-impl.rs:17:24
+  --> $DIR/cycle-via-builtin-auto-trait-impl.rs:16:24
    |
 LL | impl<T: RefUnwindSafe> Database for T {
    |         -------------  ^^^^^^^^     ^