Auto merge of rust-lang#106801 - JohnTitor:rollup-xqkraw0, r=JohnTitor

Rollup of 6 pull requests

Successful merges:

 - rust-lang#106608 (Render missing generics suggestion verbosely)
 - rust-lang#106716 ([RFC 2397] Deny incorrect locations)
 - rust-lang#106754 (Rename `Ty::is_ty_infer` -> `Ty::is_ty_or_numeric_infer`)
 - rust-lang#106782 (Ignore tests move in git blame)
 - rust-lang#106785 (Make blame spans better for impl wfcheck)
 - rust-lang#106791 (Fix ICE formatting)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

.git-blame-ignore-revs

@@ -8,3 +8,5 @@ a06baa56b95674fc626b3c3fd680d6a65357fe60
 283abbf0e7d20176f76006825b5c52e9a4234e4c
 # format libstd/sys
 c34fbfaad38cf5829ef5cfe780dc9d58480adeaa
+# move tests
+cf2dff2b1e3fa55fa5415d524200070d0d7aacfe

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -79,7 +79,7 @@ impl<'tcx> RegionErrors<'tcx> {
     #[track_caller]
     pub fn push(&mut self, val: impl Into<RegionErrorKind<'tcx>>) {
         let val = val.into();
-        self.1.sess.delay_span_bug(DUMMY_SP, "{val:?}");
+        self.1.sess.delay_span_bug(DUMMY_SP, format!("{val:?}"));
         self.0.push(val);
     }
     pub fn is_empty(&self) -> bool {

compiler/rustc_error_messages/locales/en-US/passes.ftl

@@ -4,6 +4,9 @@
 -passes_see_issue =
     see issue #{$issue} <https://github.com/rust-lang/rust/issues/{$issue}> for more information
 
+passes_incorrect_do_not_recommend_location =
+    `#[do_not_recommend]` can only be placed on trait implementations
+
 passes_outer_crate_level_attr =
     crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
 

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -1254,7 +1254,11 @@ fn check_impl<'tcx>(
                 // therefore don't need to be WF (the trait's `Self: Trait` predicate
                 // won't hold).
                 let trait_ref = tcx.impl_trait_ref(item.owner_id).unwrap();
-                let trait_ref = wfcx.normalize(ast_trait_ref.path.span, None, trait_ref);
+                let trait_ref = wfcx.normalize(
+                    ast_trait_ref.path.span,
+                    Some(WellFormedLoc::Ty(item.hir_id().expect_owner().def_id)),
+                    trait_ref,
+                );
                 let trait_pred = ty::TraitPredicate {
                     trait_ref,
                     constness: match constness {
@@ -1263,14 +1267,21 @@ fn check_impl<'tcx>(
                     },
                     polarity: ty::ImplPolarity::Positive,
                 };
-                let obligations = traits::wf::trait_obligations(
+                let mut obligations = traits::wf::trait_obligations(
                     wfcx.infcx,
                     wfcx.param_env,
                     wfcx.body_id,
                     &trait_pred,
                     ast_trait_ref.path.span,
                     item,
                 );
+                for obligation in &mut obligations {
+                    if let Some(pred) = obligation.predicate.to_opt_poly_trait_pred()
+                        && pred.self_ty().skip_binder() == trait_ref.self_ty()
+                    {
+                        obligation.cause.span = ast_self_ty.span;
+                    }
+                }
                 debug!(?obligations);
                 wfcx.register_obligations(obligations);
             }

compiler/rustc_hir_analysis/src/hir_wf_check.rs

@@ -114,51 +114,63 @@ fn diagnostic_hir_wf_check<'tcx>(
     // Get the starting `hir::Ty` using our `WellFormedLoc`.
     // We will walk 'into' this type to try to find
     // a more precise span for our predicate.
-    let ty = match loc {
+    let tys = match loc {
         WellFormedLoc::Ty(_) => match hir.get(hir_id) {
             hir::Node::ImplItem(item) => match item.kind {
-                hir::ImplItemKind::Type(ty) => Some(ty),
-                hir::ImplItemKind::Const(ty, _) => Some(ty),
+                hir::ImplItemKind::Type(ty) => vec![ty],
+                hir::ImplItemKind::Const(ty, _) => vec![ty],
                 ref item => bug!("Unexpected ImplItem {:?}", item),
             },
             hir::Node::TraitItem(item) => match item.kind {
-                hir::TraitItemKind::Type(_, ty) => ty,
-                hir::TraitItemKind::Const(ty, _) => Some(ty),
+                hir::TraitItemKind::Type(_, ty) => ty.into_iter().collect(),
+                hir::TraitItemKind::Const(ty, _) => vec![ty],
                 ref item => bug!("Unexpected TraitItem {:?}", item),
             },
             hir::Node::Item(item) => match item.kind {
-                hir::ItemKind::Static(ty, _, _) | hir::ItemKind::Const(ty, _) => Some(ty),
-                hir::ItemKind::Impl(ref impl_) => {
-                    assert!(impl_.of_trait.is_none(), "Unexpected trait impl: {:?}", impl_);
-                    Some(impl_.self_ty)
-                }
+                hir::ItemKind::Static(ty, _, _) | hir::ItemKind::Const(ty, _) => vec![ty],
+                hir::ItemKind::Impl(ref impl_) => match &impl_.of_trait {
+                    Some(t) => t
+                        .path
+                        .segments
+                        .last()
+                        .iter()
+                        .flat_map(|seg| seg.args().args)
+                        .filter_map(|arg| {
+                            if let hir::GenericArg::Type(ty) = arg { Some(*ty) } else { None }
+                        })
+                        .chain([impl_.self_ty])
+                        .collect(),
+                    None => {
+                        vec![impl_.self_ty]
+                    }
+                },
                 ref item => bug!("Unexpected item {:?}", item),
             },
-            hir::Node::Field(field) => Some(field.ty),
+            hir::Node::Field(field) => vec![field.ty],
             hir::Node::ForeignItem(ForeignItem {
                 kind: ForeignItemKind::Static(ty, _), ..
-            }) => Some(*ty),
+            }) => vec![*ty],
             hir::Node::GenericParam(hir::GenericParam {
                 kind: hir::GenericParamKind::Type { default: Some(ty), .. },
                 ..
-            }) => Some(*ty),
+            }) => vec![*ty],
             ref node => bug!("Unexpected node {:?}", node),
         },
         WellFormedLoc::Param { function: _, param_idx } => {
             let fn_decl = hir.fn_decl_by_hir_id(hir_id).unwrap();
             // Get return type
             if param_idx as usize == fn_decl.inputs.len() {
                 match fn_decl.output {
-                    hir::FnRetTy::Return(ty) => Some(ty),
+                    hir::FnRetTy::Return(ty) => vec![ty],
                     // The unit type `()` is always well-formed
-                    hir::FnRetTy::DefaultReturn(_span) => None,
+                    hir::FnRetTy::DefaultReturn(_span) => vec![],
                 }
             } else {
-                Some(&fn_decl.inputs[param_idx as usize])
+                vec![&fn_decl.inputs[param_idx as usize]]
             }
         }
     };
-    if let Some(ty) = ty {
+    for ty in tys {
         visitor.visit_ty(ty);
     }
     visitor.cause

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1782,9 +1782,9 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                             // like when you have two references but one is `usize` and the other
                             // is `f32`. In those cases we still want to show the `note`. If the
                             // value from `ef` is `Infer(_)`, then we ignore it.
-                            if !ef.expected.is_ty_infer() {
+                            if !ef.expected.is_ty_or_numeric_infer() {
                                 ef.expected != values.expected
-                            } else if !ef.found.is_ty_infer() {
+                            } else if !ef.found.is_ty_or_numeric_infer() {
                                 ef.found != values.found
                             } else {
                                 false

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -78,7 +78,7 @@ impl InferenceDiagnosticsData {
     }
 
     fn where_x_is_kind(&self, in_type: Ty<'_>) -> &'static str {
-        if in_type.is_ty_infer() {
+        if in_type.is_ty_or_numeric_infer() {
             ""
         } else if self.name == "_" {
             // FIXME: Consider specializing this message if there is a single `_`
@@ -195,12 +195,12 @@ fn ty_to_string<'tcx>(
         // invalid pseudo-syntax, we want the `fn`-pointer output instead.
         (ty::FnDef(..), _) => ty.fn_sig(infcx.tcx).print(printer).unwrap().into_buffer(),
         (_, Some(def_id))
-            if ty.is_ty_infer()
+            if ty.is_ty_or_numeric_infer()
                 && infcx.tcx.get_diagnostic_item(sym::iterator_collect_fn) == Some(def_id) =>
         {
             "Vec<_>".to_string()
         }
-        _ if ty.is_ty_infer() => "/* Type */".to_string(),
+        _ if ty.is_ty_or_numeric_infer() => "/* Type */".to_string(),
         // FIXME: The same thing for closures, but this only works when the closure
         // does not capture anything.
         //
@@ -680,7 +680,7 @@ impl<'tcx> InferSourceKind<'tcx> {
             | InferSourceKind::ClosureReturn { ty, .. } => {
                 if ty.is_closure() {
                     ("closure", closure_as_fn_str(infcx, ty))
-                } else if !ty.is_ty_infer() {
+                } else if !ty.is_ty_or_numeric_infer() {
                     ("normal", ty_to_string(infcx, ty, None))
                 } else {
                     ("other", String::new())
@@ -813,7 +813,7 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
         self.attempt += 1;
         if let Some(InferSource { kind: InferSourceKind::GenericArg { def_id: did, ..}, .. }) = self.infer_source
             && let InferSourceKind::LetBinding { ref ty, ref mut def_id, ..} = new_source.kind
-            && ty.is_ty_infer()
+            && ty.is_ty_or_numeric_infer()
         {
             // Customize the output so we talk about `let x: Vec<_> = iter.collect();` instead of
             // `let x: _ = iter.collect();`, as this is a very common case.

compiler/rustc_middle/src/ty/sty.rs

@@ -1686,7 +1686,7 @@ impl<'tcx> Ty<'tcx> {
     }
 
     #[inline]
-    pub fn is_ty_infer(self) -> bool {
+    pub fn is_ty_or_numeric_infer(self) -> bool {
         matches!(self.kind(), Infer(_))
     }
 

compiler/rustc_middle/src/ty/subst.rs

@@ -202,7 +202,7 @@ impl<'tcx> GenericArg<'tcx> {
     pub fn is_non_region_infer(self) -> bool {
         match self.unpack() {
             GenericArgKind::Lifetime(_) => false,
-            GenericArgKind::Type(ty) => ty.is_ty_infer(),
+            GenericArgKind::Type(ty) => ty.is_ty_or_numeric_infer(),
             GenericArgKind::Const(ct) => ct.is_ct_infer(),
         }
     }

compiler/rustc_passes/src/check_attr.rs

@@ -82,6 +82,7 @@ impl CheckAttrVisitor<'_> {
         let attrs = self.tcx.hir().attrs(hir_id);
         for attr in attrs {
             let attr_is_valid = match attr.name_or_empty() {
+                sym::do_not_recommend => self.check_do_not_recommend(attr.span, target),
                 sym::inline => self.check_inline(hir_id, attr, span, target),
                 sym::no_coverage => self.check_no_coverage(hir_id, attr, span, target),
                 sym::non_exhaustive => self.check_non_exhaustive(hir_id, attr, span, target),
@@ -241,6 +242,16 @@ impl CheckAttrVisitor<'_> {
         );
     }
 
+    /// Checks if `#[do_not_recommend]` is applied on a trait impl.
+    fn check_do_not_recommend(&self, attr_span: Span, target: Target) -> bool {
+        if let Target::Impl = target {
+            true
+        } else {
+            self.tcx.sess.emit_err(errors::IncorrectDoNotRecommendLocation { span: attr_span });
+            false
+        }
+    }
+
     /// Checks if an `#[inline]` is applied to a function or a closure. Returns `true` if valid.
     fn check_inline(&self, hir_id: HirId, attr: &Attribute, span: Span, target: Target) -> bool {
         match target {