Auto merge of rust-lang#126037 - matthiaskrgr:rollup-7pz1nhr, r=matth…

…iaskrgr

Rollup of 10 pull requests

Successful merges:

 - rust-lang#124746 (`rustc --explain E0582` additional example)
 - rust-lang#125407 (Detect when user is trying to create a lending `Iterator` and give a custom explanation)
 - rust-lang#125505 (Add intra-doc-links to rustc_middle crate-level docs.)
 - rust-lang#125792 (Don't drop `Unsize` candidate in intercrate mode)
 - rust-lang#125819 (Various `HirTyLowerer` cleanups)
 - rust-lang#125861 (rustc_codegen_ssa: fix `get_rpath_relative_to_output` panic when lib only contains file name)
 - rust-lang#125911 (delete bootstrap build before switching to bumped rustc)
 - rust-lang#125921 (coverage: Carve out hole spans in a separate early pass)
 - rust-lang#125940 (std::unix::fs::get_path: using fcntl codepath for netbsd instead.)
 - rust-lang#126022 (set `has_unconstrained_ty_var` when generalizing aliases in bivariant contexts)

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

compiler/rustc_codegen_ssa/src/back/rpath.rs

@@ -85,6 +85,11 @@ fn get_rpath_relative_to_output(config: &RPathConfig<'_>, lib: &Path) -> OsStrin
     // Strip filenames
     let lib = lib.parent().unwrap();
     let output = config.out_filename.parent().unwrap();
+
+    // If output or lib is empty, just assume it locates in current path
+    let lib = if lib == Path::new("") { Path::new(".") } else { lib };
+    let output = if output == Path::new("") { Path::new(".") } else { output };
+
     let lib = try_canonicalize(lib).unwrap();
     let output = try_canonicalize(output).unwrap();
     let relative = path_relative_from(&lib, &output)

compiler/rustc_codegen_ssa/src/back/rpath/tests.rs

@@ -57,6 +57,22 @@ fn test_rpath_relative() {
     }
 }
 
+#[test]
+fn test_rpath_relative_issue_119571() {
+    let config = &mut RPathConfig {
+        libs: &[],
+        out_filename: PathBuf::from("rustc"),
+        has_rpath: true,
+        is_like_osx: false,
+        linker_is_gnu: true,
+    };
+    // Should not panic when out_filename only contains filename.
+    // Issue 119571
+    let _ = get_rpath_relative_to_output(config, Path::new("lib/libstd.so"));
+    // Should not panic when lib only contains filename.
+    let _ = get_rpath_relative_to_output(config, Path::new("libstd.so"));
+}
+
 #[test]
 fn test_xlinker() {
     let args = rpaths_to_flags(vec!["a/normal/path".into(), "a,comma,path".into()]);

compiler/rustc_error_codes/src/error_codes/E0582.md

@@ -27,6 +27,40 @@ fn bar<F, G>(t: F, u: G)
 fn main() { }
 ```
 
+This error also includes the use of associated types with lifetime parameters.
+```compile_fail,E0582
+trait Foo {
+    type Assoc<'a>;
+}
+
+struct Bar<X, F>
+where
+    X: Foo,
+    F: for<'a> Fn(X::Assoc<'a>) -> &'a i32
+{
+    x: X,
+    f: F
+}
+```
+The latter scenario encounters this error because `Foo::Assoc<'a>` could be
+implemented by a type that does not use the `'a` parameter, so there is no
+guarentee that `X::Assoc<'a>` actually uses `'a`.
+
+To fix this we can pass a dummy parameter:
+```
+# trait Foo {
+#     type Assoc<'a>;
+# }
+struct Bar<X, F>
+where
+    X: Foo,
+    F: for<'a> Fn(X::Assoc<'a>, /* dummy */ &'a ()) -> &'a i32
+{
+    x: X,
+    f: F
+}
+```
+
 Note: The examples above used to be (erroneously) accepted by the
 compiler, but this was since corrected. See [issue #33685] for more
 details.

compiler/rustc_hir_analysis/src/collect.rs

@@ -18,11 +18,11 @@ use rustc_ast::Recovered;
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
 use rustc_data_structures::unord::UnordMap;
-use rustc_errors::{Applicability, Diag, ErrorGuaranteed, StashKey};
-use rustc_hir as hir;
+use rustc_errors::{struct_span_code_err, Applicability, Diag, ErrorGuaranteed, StashKey, E0228};
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
-use rustc_hir::intravisit::{self, Visitor};
+use rustc_hir::intravisit::{self, walk_generics, Visitor};
+use rustc_hir::{self as hir};
 use rustc_hir::{GenericParamKind, Node};
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_infer::traits::ObligationCause;
@@ -44,7 +44,7 @@ use std::ops::Bound;
 
 use crate::check::intrinsic::intrinsic_operation_unsafety;
 use crate::errors;
-use crate::hir_ty_lowering::HirTyLowerer;
+use crate::hir_ty_lowering::{HirTyLowerer, RegionInferReason};
 pub use type_of::test_opaque_hidden_types;
 
 mod generics_of;
@@ -370,16 +370,26 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
         self.tcx
     }
 
-    fn item_def_id(&self) -> DefId {
-        self.item_def_id.to_def_id()
+    fn item_def_id(&self) -> LocalDefId {
+        self.item_def_id
     }
 
-    fn allow_infer(&self) -> bool {
-        false
-    }
-
-    fn re_infer(&self, _: Option<&ty::GenericParamDef>, _: Span) -> Option<ty::Region<'tcx>> {
-        None
+    fn re_infer(&self, span: Span, reason: RegionInferReason<'_>) -> ty::Region<'tcx> {
+        if let RegionInferReason::BorrowedObjectLifetimeDefault = reason {
+            let e = struct_span_code_err!(
+                self.tcx().dcx(),
+                span,
+                E0228,
+                "the lifetime bound for this object type cannot be deduced \
+                from context; please supply an explicit bound"
+            )
+            .emit();
+            self.set_tainted_by_errors(e);
+            ty::Region::new_error(self.tcx(), e)
+        } else {
+            // This indicates an illegal lifetime in a non-assoc-trait position
+            ty::Region::new_error_with_message(self.tcx(), span, "unelided lifetime in signature")
+        }
     }
 
     fn ty_infer(&self, _: Option<&ty::GenericParamDef>, span: Span) -> Ty<'tcx> {
@@ -510,6 +520,89 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
     fn set_tainted_by_errors(&self, err: ErrorGuaranteed) {
         self.tainted_by_errors.set(Some(err));
     }
+
+    fn lower_fn_sig(
+        &self,
+        decl: &hir::FnDecl<'tcx>,
+        generics: Option<&hir::Generics<'_>>,
+        hir_id: rustc_hir::HirId,
+        hir_ty: Option<&hir::Ty<'_>>,
+    ) -> (Vec<Ty<'tcx>>, Ty<'tcx>) {
+        let tcx = self.tcx();
+        // We proactively collect all the inferred type params to emit a single error per fn def.
+        let mut visitor = HirPlaceholderCollector::default();
+        let mut infer_replacements = vec![];
+
+        if let Some(generics) = generics {
+            walk_generics(&mut visitor, generics);
+        }
+
+        let input_tys = decl
+            .inputs
+            .iter()
+            .enumerate()
+            .map(|(i, a)| {
+                if let hir::TyKind::Infer = a.kind {
+                    if let Some(suggested_ty) =
+                        self.lowerer().suggest_trait_fn_ty_for_impl_fn_infer(hir_id, Some(i))
+                    {
+                        infer_replacements.push((a.span, suggested_ty.to_string()));
+                        return Ty::new_error_with_message(tcx, a.span, suggested_ty.to_string());
+                    }
+                }
+
+                // Only visit the type looking for `_` if we didn't fix the type above
+                visitor.visit_ty(a);
+                self.lowerer().lower_arg_ty(a, None)
+            })
+            .collect();
+
+        let output_ty = match decl.output {
+            hir::FnRetTy::Return(output) => {
+                if let hir::TyKind::Infer = output.kind
+                    && let Some(suggested_ty) =
+                        self.lowerer().suggest_trait_fn_ty_for_impl_fn_infer(hir_id, None)
+                {
+                    infer_replacements.push((output.span, suggested_ty.to_string()));
+                    Ty::new_error_with_message(tcx, output.span, suggested_ty.to_string())
+                } else {
+                    visitor.visit_ty(output);
+                    self.lower_ty(output)
+                }
+            }
+            hir::FnRetTy::DefaultReturn(..) => tcx.types.unit,
+        };
+
+        if !(visitor.0.is_empty() && infer_replacements.is_empty()) {
+            // We check for the presence of
+            // `ident_span` to not emit an error twice when we have `fn foo(_: fn() -> _)`.
+
+            let mut diag = crate::collect::placeholder_type_error_diag(
+                tcx,
+                generics,
+                visitor.0,
+                infer_replacements.iter().map(|(s, _)| *s).collect(),
+                true,
+                hir_ty,
+                "function",
+            );
+
+            if !infer_replacements.is_empty() {
+                diag.multipart_suggestion(
+                    format!(
+                    "try replacing `_` with the type{} in the corresponding trait method signature",
+                    rustc_errors::pluralize!(infer_replacements.len()),
+                ),
+                    infer_replacements,
+                    Applicability::MachineApplicable,
+                );
+            }
+
+            self.set_tainted_by_errors(diag.emit());
+        }
+
+        (input_tys, output_ty)
+    }
 }
 
 /// Synthesize a new lifetime name that doesn't clash with any of the lifetimes already present.

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -1,7 +1,7 @@
 use crate::bounds::Bounds;
 use crate::collect::ItemCtxt;
 use crate::constrained_generic_params as cgp;
-use crate::hir_ty_lowering::{HirTyLowerer, OnlySelfBounds, PredicateFilter};
+use crate::hir_ty_lowering::{HirTyLowerer, OnlySelfBounds, PredicateFilter, RegionInferReason};
 use hir::{HirId, Node};
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_hir as hir;
@@ -117,7 +117,6 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
     let mut is_trait = None;
     let mut is_default_impl_trait = None;
 
-    // FIXME: Should ItemCtxt take a LocalDefId?
     let icx = ItemCtxt::new(tcx, def_id);
 
     const NO_GENERICS: &hir::Generics<'_> = hir::Generics::empty();
@@ -244,12 +243,15 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
             }
 
             hir::WherePredicate::RegionPredicate(region_pred) => {
-                let r1 = icx.lowerer().lower_lifetime(region_pred.lifetime, None);
+                let r1 = icx
+                    .lowerer()
+                    .lower_lifetime(region_pred.lifetime, RegionInferReason::RegionPredicate);
                 predicates.extend(region_pred.bounds.iter().map(|bound| {
                     let (r2, span) = match bound {
-                        hir::GenericBound::Outlives(lt) => {
-                            (icx.lowerer().lower_lifetime(lt, None), lt.ident.span)
-                        }
+                        hir::GenericBound::Outlives(lt) => (
+                            icx.lowerer().lower_lifetime(lt, RegionInferReason::RegionPredicate),
+                            lt.ident.span,
+                        ),
                         bound => {
                             span_bug!(
                                 bound.span(),

compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs

@@ -18,6 +18,8 @@ use crate::bounds::Bounds;
 use crate::errors;
 use crate::hir_ty_lowering::{HirTyLowerer, OnlySelfBounds, PredicateFilter};
 
+use super::RegionInferReason;
+
 impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
     /// Add a `Sized` bound to the `bounds` if appropriate.
     ///
@@ -166,7 +168,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     );
                 }
                 hir::GenericBound::Outlives(lifetime) => {
-                    let region = self.lower_lifetime(lifetime, None);
+                    let region = self.lower_lifetime(lifetime, RegionInferReason::OutlivesBound);
                     bounds.push_region_bound(
                         self.tcx(),
                         ty::Binder::bind_with_vars(