Rollup of 10 pull requests

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

@@ -20,6 +20,10 @@ hir_analysis_lifetimes_or_bounds_mismatch_on_trait =
     .where_label = this `where` clause might not match the one in the trait
     .bounds_label = this bound might be missing in the impl
 
+hir_analysis_async_trait_impl_should_be_async =
+    method `{$method_name}` should be async because the method from the trait is async
+    .trait_item_label = required because the trait method is async
+
 hir_analysis_drop_impl_on_wrong_item =
     the `Drop` trait may only be implemented for local structs, enums, and unions
     .label = must be a struct, enum, or union in the current crate

compiler/rustc_hir_analysis/src/check/compare_method.rs

@@ -67,6 +67,10 @@ pub(crate) fn compare_impl_method<'tcx>(
         return;
     }
 
+    if let Err(_) = compare_asyncness(tcx, impl_m, impl_m_span, trait_m, trait_item_span) {
+        return;
+    }
+
     if let Err(_) = compare_predicate_entailment(tcx, impl_m, impl_m_span, trait_m, impl_trait_ref)
     {
         return;
@@ -323,6 +327,34 @@ fn compare_predicate_entailment<'tcx>(
     Ok(())
 }
 
+fn compare_asyncness<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    impl_m: &ty::AssocItem,
+    impl_m_span: Span,
+    trait_m: &ty::AssocItem,
+    trait_item_span: Option<Span>,
+) -> Result<(), ErrorGuaranteed> {
+    if tcx.asyncness(trait_m.def_id) == hir::IsAsync::Async {
+        match tcx.fn_sig(impl_m.def_id).skip_binder().output().kind() {
+            ty::Opaque(..) => {
+                // allow both `async fn foo()` and `fn foo() -> impl Future`
+            }
+            ty::Error(rustc_errors::ErrorGuaranteed { .. }) => {
+                // We don't know if it's ok, but at least it's already an error.
+            }
+            _ => {
+                return Err(tcx.sess.emit_err(crate::errors::AsyncTraitImplShouldBeAsync {
+                    span: impl_m_span,
+                    method_name: trait_m.name,
+                    trait_item_span,
+                }));
+            }
+        };
+    }
+
+    Ok(())
+}
+
 #[instrument(skip(tcx), level = "debug", ret)]
 pub fn collect_trait_impl_trait_tys<'tcx>(
     tcx: TyCtxt<'tcx>,

compiler/rustc_hir_analysis/src/errors.rs

@@ -51,6 +51,17 @@ pub struct LifetimesOrBoundsMismatchOnTrait {
     pub ident: Ident,
 }
 
+#[derive(Diagnostic)]
+#[diag(hir_analysis_async_trait_impl_should_be_async)]
+pub struct AsyncTraitImplShouldBeAsync {
+    #[primary_span]
+    // #[label]
+    pub span: Span,
+    #[label(trait_item_label)]
+    pub trait_item_span: Option<Span>,
+    pub method_name: Symbol,
+}
+
 #[derive(Diagnostic)]
 #[diag(hir_analysis_drop_impl_on_wrong_item, code = "E0120")]
 pub struct DropImplOnWrongItem {

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -13,7 +13,9 @@ use rustc_hir_analysis::astconv::AstConv;
 use rustc_infer::infer;
 use rustc_infer::traits::{self, StatementAsExpression};
 use rustc_middle::lint::in_external_macro;
-use rustc_middle::ty::{self, Binder, DefIdTree, IsSuggestable, ToPredicate, Ty};
+use rustc_middle::ty::{
+    self, suggest_constraining_type_params, Binder, DefIdTree, IsSuggestable, ToPredicate, Ty,
+};
 use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
@@ -1276,17 +1278,18 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             && !results.expr_adjustments(callee_expr).iter().any(|adj| matches!(adj.kind, ty::adjustment::Adjust::Deref(..)))
             // Check that we're in fact trying to clone into the expected type
             && self.can_coerce(*pointee_ty, expected_ty)
+            && let predicate = ty::Binder::dummy(ty::TraitRef {
+                def_id: clone_trait_did,
+                substs: self.tcx.mk_substs([expected_ty.into()].iter()),
+            })
+                .without_const()
+                .to_predicate(self.tcx)
             // And the expected type doesn't implement `Clone`
             && !self.predicate_must_hold_considering_regions(&traits::Obligation {
                 cause: traits::ObligationCause::dummy(),
                 param_env: self.param_env,
                 recursion_depth: 0,
-                predicate: ty::Binder::dummy(ty::TraitRef {
-                    def_id: clone_trait_did,
-                    substs: self.tcx.mk_substs([expected_ty.into()].iter()),
-                })
-                .without_const()
-                .to_predicate(self.tcx),
+                predicate,
             })
         {
             diag.span_note(
@@ -1295,6 +1298,19 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     "`{expected_ty}` does not implement `Clone`, so `{found_ty}` was cloned instead"
                 ),
             );
+            let owner = self.tcx.hir().enclosing_body_owner(expr.hir_id);
+            if let ty::Param(param) = expected_ty.kind()
+                && let Some(generics) = self.tcx.hir().get_generics(owner)
+            {
+                suggest_constraining_type_params(
+                    self.tcx,
+                    generics,
+                    diag,
+                    vec![(param.name.as_str(), "Clone", Some(clone_trait_did))].into_iter(),
+                );
+            } else {
+                self.suggest_derive(diag, &[(predicate, None, None)]);
+            }
         }
     }
 

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -25,7 +25,7 @@ use rustc_middle::infer::unify_key::{ConstVariableOrigin, ConstVariableOriginKin
 use rustc_middle::traits::util::supertraits;
 use rustc_middle::ty::fast_reject::DeepRejectCtxt;
 use rustc_middle::ty::fast_reject::{simplify_type, TreatParams};
-use rustc_middle::ty::print::with_crate_prefix;
+use rustc_middle::ty::print::{with_crate_prefix, with_forced_trimmed_paths};
 use rustc_middle::ty::{self, DefIdTree, GenericArgKind, Ty, TyCtxt, TypeVisitable};
 use rustc_middle::ty::{IsSuggestable, ToPolyTraitRef};
 use rustc_span::symbol::{kw, sym, Ident};
@@ -270,7 +270,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let tcx = self.tcx;
 
                 let rcvr_ty = self.resolve_vars_if_possible(rcvr_ty);
-                let ty_str = self.ty_to_string(rcvr_ty);
+                let ty_str = with_forced_trimmed_paths!(self.ty_to_string(rcvr_ty));
                 let is_method = mode == Mode::MethodCall;
                 let item_kind = if is_method {
                     "method"
@@ -565,7 +565,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 let term = pred.skip_binder().term;
 
                                 let obligation = format!("{} = {}", projection_ty, term);
-                                let quiet = format!("{} = {}", quiet_projection_ty, term);
+                                let quiet = with_forced_trimmed_paths!(format!(
+                                    "{} = {}",
+                                    quiet_projection_ty, term
+                                ));
 
                                 bound_span_label(projection_ty.self_ty(), &obligation, &quiet);
                                 Some((obligation, projection_ty.self_ty()))
@@ -575,7 +578,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 let self_ty = p.self_ty();
                                 let path = p.print_only_trait_path();
                                 let obligation = format!("{}: {}", self_ty, path);
-                                let quiet = format!("_: {}", path);
+                                let quiet = with_forced_trimmed_paths!(format!("_: {}", path));
                                 bound_span_label(self_ty, &obligation, &quiet);
                                 Some((obligation, self_ty))
                             }
@@ -798,7 +801,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 (None, None)
                             };
                         let primary_message = primary_message.unwrap_or_else(|| format!(
-                            "the {item_kind} `{item_name}` exists for {actual_prefix} `{ty_str}`, but its trait bounds were not satisfied"
+                            "the {item_kind} `{item_name}` exists for {actual_prefix} `{ty_str}`, \
+                             but its trait bounds were not satisfied"
                         ));
                         err.set_primary_message(&primary_message);
                         if let Some(label) = label {
@@ -895,7 +899,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             }
                         }
                     } else {
-                        err.span_label(span, format!("{item_kind} cannot be called on `{ty_str}` due to unsatisfied trait bounds"));
+                        err.span_label(
+                            span,
+                            format!(
+                                "{item_kind} cannot be called on `{ty_str}` due to unsatisfied \
+                                 trait bounds",
+                            ),
+                        );
                     }
                 };
 
@@ -1843,7 +1853,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.suggest_derive(err, &preds);
     }
 
-    fn suggest_derive(
+    pub fn suggest_derive(
         &self,
         err: &mut Diagnostic,
         unsatisfied_predicates: &[(

compiler/rustc_middle/src/ty/diagnostics.rs

@@ -3,8 +3,8 @@
 use std::ops::ControlFlow;
 
 use crate::ty::{
-    visit::TypeVisitable, AliasTy, Const, ConstKind, DefIdTree, ExistentialPredicate, InferConst,
-    InferTy, Opaque, PolyTraitPredicate, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor,
+    visit::TypeVisitable, AliasTy, Const, ConstKind, DefIdTree, InferConst, InferTy, Opaque,
+    PolyTraitPredicate, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor,
 };
 
 use rustc_data_structures::fx::FxHashMap;
@@ -469,17 +469,6 @@ impl<'tcx> TypeVisitor<'tcx> for IsSuggestableVisitor<'tcx> {
                 }
             }
 
-            Dynamic(dty, _, _) => {
-                for pred in *dty {
-                    match pred.skip_binder() {
-                        ExistentialPredicate::Trait(_) | ExistentialPredicate::Projection(_) => {
-                            // Okay
-                        }
-                        _ => return ControlFlow::Break(()),
-                    }
-                }
-            }
-
             Param(param) => {
                 // FIXME: It would be nice to make this not use string manipulation,
                 // but it's pretty hard to do this, since `ty::ParamTy` is missing

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -16,6 +16,7 @@ use rustc_session::config::TrimmedDefPaths;
 use rustc_session::cstore::{ExternCrate, ExternCrateSource};
 use rustc_session::Limit;
 use rustc_span::symbol::{kw, Ident, Symbol};
+use rustc_span::FileNameDisplayPreference;
 use rustc_target::abi::Size;
 use rustc_target::spec::abi::Abi;
 use smallvec::SmallVec;
@@ -818,11 +819,16 @@ pub trait PrettyPrinter<'tcx>:
                             p!("@", print_def_path(did.to_def_id(), substs));
                         } else {
                             let span = self.tcx().def_span(did);
+                            let preference = if FORCE_TRIMMED_PATH.with(|flag| flag.get()) {
+                                FileNameDisplayPreference::Short
+                            } else {
+                                FileNameDisplayPreference::Remapped
+                            };
                             p!(write(
                                 "@{}",
                                 // This may end up in stderr diagnostics but it may also be emitted
                                 // into MIR. Hence we use the remapped path if available
-                                self.tcx().sess.source_map().span_to_embeddable_string(span)
+                                self.tcx().sess.source_map().span_to_string(span, preference)
                             ));
                         }
                     } else {

compiler/rustc_span/src/lib.rs

@@ -259,6 +259,10 @@ impl RealFileName {
             FileNameDisplayPreference::Remapped => {
                 self.remapped_path_if_available().to_string_lossy()
             }
+            FileNameDisplayPreference::Short => self
+                .local_path_if_available()
+                .file_name()
+                .map_or_else(|| "".into(), |f| f.to_string_lossy()),
         }
     }
 }
@@ -302,6 +306,9 @@ pub enum FileNameDisplayPreference {
     /// Display the path before the application of rewrite rules provided via `--remap-path-prefix`.
     /// This is appropriate for use in user-facing output (such as diagnostics).
     Local,
+    /// Display only the filename, as a way to reduce the verbosity of the output.
+    /// This is appropriate for use in user-facing output (such as diagnostics).
+    Short,
 }
 
 pub struct FileNameDisplay<'a> {

compiler/rustc_span/src/source_map.rs

@@ -438,20 +438,27 @@ impl SourceMap {
         }
     }
 
-    fn span_to_string(&self, sp: Span, filename_display_pref: FileNameDisplayPreference) -> String {
+    pub fn span_to_string(
+        &self,
+        sp: Span,
+        filename_display_pref: FileNameDisplayPreference,
+    ) -> String {
         if self.files.borrow().source_files.is_empty() || sp.is_dummy() {
             return "no-location".to_string();
         }
 
         let lo = self.lookup_char_pos(sp.lo());
         let hi = self.lookup_char_pos(sp.hi());
         format!(
-            "{}:{}:{}: {}:{}",
+            "{}:{}:{}{}",
             lo.file.name.display(filename_display_pref),
             lo.line,
             lo.col.to_usize() + 1,
-            hi.line,
-            hi.col.to_usize() + 1,
+            if let FileNameDisplayPreference::Short = filename_display_pref {
+                String::new()
+            } else {
+                format!(": {}:{}", hi.line, hi.col.to_usize() + 1)
+            }
         )
     }