Rollup of 7 pull requests

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -43,7 +43,6 @@ use rustc_codegen_ssa::CodegenResults;
 use rustc_codegen_ssa::back::versioned_llvm_target;
 use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_data_structures::profiling::SelfProfilerRef;
-use rustc_errors::ErrorGuaranteed;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_session::Session;
@@ -56,7 +55,6 @@ use crate::prelude::*;
 mod abi;
 mod allocator;
 mod analyze;
-mod archive;
 mod base;
 mod cast;
 mod codegen_i128;
@@ -249,17 +247,6 @@ impl CodegenBackend for CraneliftCodegenBackend {
             self.config.borrow().as_ref().unwrap(),
         )
     }
-
-    fn link(
-        &self,
-        sess: &Session,
-        codegen_results: CodegenResults,
-        outputs: &OutputFilenames,
-    ) -> Result<(), ErrorGuaranteed> {
-        use rustc_codegen_ssa::back::link::link_binary;
-
-        link_binary(sess, &crate::archive::ArArchiveBuilderBuilder, &codegen_results, outputs)
-    }
 }
 
 fn target_triple(sess: &Session) -> target_lexicon::Triple {

compiler/rustc_codegen_gcc/src/lib.rs

@@ -58,7 +58,6 @@ extern crate rustc_driver;
 
 mod abi;
 mod allocator;
-mod archive;
 mod asm;
 mod attributes;
 mod back;
@@ -103,7 +102,7 @@ use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, WriteBacken
 use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleCodegen};
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::IntoDynSyncSend;
-use rustc_errors::{DiagCtxtHandle, ErrorGuaranteed};
+use rustc_errors::DiagCtxtHandle;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::ty::TyCtxt;
@@ -261,17 +260,6 @@ impl CodegenBackend for GccCodegenBackend {
             .join(sess)
     }
 
-    fn link(
-        &self,
-        sess: &Session,
-        codegen_results: CodegenResults,
-        outputs: &OutputFilenames,
-    ) -> Result<(), ErrorGuaranteed> {
-        use rustc_codegen_ssa::back::link::link_binary;
-
-        link_binary(sess, &crate::archive::ArArchiveBuilderBuilder, &codegen_results, outputs)
-    }
-
     fn target_features(&self, sess: &Session, allow_unstable: bool) -> Vec<Symbol> {
         target_features(sess, allow_unstable, &self.target_info)
     }

compiler/rustc_codegen_llvm/src/lib.rs

@@ -382,7 +382,7 @@ impl CodegenBackend for LlvmCodegenBackend {
 
         // Run the linker on any artifacts that resulted from the LLVM run.
         // This should produce either a finished executable or library.
-        link_binary(sess, &LlvmArchiveBuilderBuilder, &codegen_results, outputs)
+        link_binary(sess, &LlvmArchiveBuilderBuilder, codegen_results, outputs)
     }
 }
 

compiler/rustc_codegen_ssa/src/back/archive.rs

@@ -304,6 +304,14 @@ pub trait ArchiveBuilder {
     fn build(self: Box<Self>, output: &Path) -> bool;
 }
 
+pub struct ArArchiveBuilderBuilder;
+
+impl ArchiveBuilderBuilder for ArArchiveBuilderBuilder {
+    fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder + 'a> {
+        Box::new(ArArchiveBuilder::new(sess, &DEFAULT_OBJECT_READER))
+    }
+}
+
 #[must_use = "must call build() to finish building the archive"]
 pub struct ArArchiveBuilder<'a> {
     sess: &'a Session,

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -69,7 +69,7 @@ pub fn ensure_removed(dcx: DiagCtxtHandle<'_>, path: &Path) {
 pub fn link_binary(
     sess: &Session,
     archive_builder_builder: &dyn ArchiveBuilderBuilder,
-    codegen_results: &CodegenResults,
+    codegen_results: CodegenResults,
     outputs: &OutputFilenames,
 ) -> Result<(), ErrorGuaranteed> {
     let _timer = sess.timer("link_binary");
@@ -116,7 +116,7 @@ pub fn link_binary(
                     link_rlib(
                         sess,
                         archive_builder_builder,
-                        codegen_results,
+                        &codegen_results,
                         RlibFlavor::Normal,
                         &path,
                     )?
@@ -126,7 +126,7 @@ pub fn link_binary(
                     link_staticlib(
                         sess,
                         archive_builder_builder,
-                        codegen_results,
+                        &codegen_results,
                         &out_filename,
                         &path,
                     )?;
@@ -137,7 +137,7 @@ pub fn link_binary(
                         archive_builder_builder,
                         crate_type,
                         &out_filename,
-                        codegen_results,
+                        &codegen_results,
                         path.as_ref(),
                     )?;
                 }

compiler/rustc_codegen_ssa/src/traits/backend.rs

@@ -16,6 +16,8 @@ use rustc_span::symbol::Symbol;
 
 use super::CodegenObject;
 use super::write::WriteBackendMethods;
+use crate::back::archive::ArArchiveBuilderBuilder;
+use crate::back::link::link_binary;
 use crate::back::write::TargetMachineFactoryFn;
 use crate::{CodegenResults, ModuleCodegen};
 
@@ -87,7 +89,9 @@ pub trait CodegenBackend {
         sess: &Session,
         codegen_results: CodegenResults,
         outputs: &OutputFilenames,
-    ) -> Result<(), ErrorGuaranteed>;
+    ) -> Result<(), ErrorGuaranteed> {
+        link_binary(sess, &ArArchiveBuilderBuilder, codegen_results, outputs)
+    }
 
     /// Returns `true` if this backend can be safely called from multiple threads.
     ///

compiler/rustc_hir/src/lang_items.rs

@@ -241,6 +241,8 @@ language_item_table! {
     DerefMut,                sym::deref_mut,           deref_mut_trait,            Target::Trait,          GenericRequirement::Exact(0);
     DerefPure,               sym::deref_pure,          deref_pure_trait,           Target::Trait,          GenericRequirement::Exact(0);
     DerefTarget,             sym::deref_target,        deref_target,               Target::AssocTy,        GenericRequirement::None;
+    Receiver,                sym::receiver,            receiver_trait,             Target::Trait,          GenericRequirement::None;
+    ReceiverTarget,          sym::receiver_target,     receiver_target,            Target::AssocTy,        GenericRequirement::None;
     LegacyReceiver,          sym::legacy_receiver,     legacy_receiver_trait,      Target::Trait,          GenericRequirement::None;
 
     Fn,                      kw::Fn,                   fn_trait,                   Target::Trait,          GenericRequirement::Exact(1);

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -1427,57 +1427,28 @@ fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id
     let predicates = tcx.predicates_of(def_id.to_def_id());
     let generics = tcx.generics_of(def_id);
 
-    let is_our_default = |def: &ty::GenericParamDef| match def.kind {
-        GenericParamDefKind::Type { has_default, .. }
-        | GenericParamDefKind::Const { has_default, .. } => {
-            has_default && def.index >= generics.parent_count as u32
-        }
-        GenericParamDefKind::Lifetime => {
-            span_bug!(tcx.def_span(def.def_id), "lifetime params can have no default")
-        }
-    };
-
     // Check that concrete defaults are well-formed. See test `type-check-defaults.rs`.
     // For example, this forbids the declaration:
     //
     //     struct Foo<T = Vec<[u32]>> { .. }
     //
     // Here, the default `Vec<[u32]>` is not WF because `[u32]: Sized` does not hold.
     for param in &generics.own_params {
-        match param.kind {
-            GenericParamDefKind::Type { .. } => {
-                if is_our_default(param) {
-                    let ty = tcx.type_of(param.def_id).instantiate_identity();
-                    // Ignore dependent defaults -- that is, where the default of one type
-                    // parameter includes another (e.g., `<T, U = T>`). In those cases, we can't
-                    // be sure if it will error or not as user might always specify the other.
-                    if !ty.has_param() {
-                        wfcx.register_wf_obligation(
-                            tcx.def_span(param.def_id),
-                            Some(WellFormedLoc::Ty(param.def_id.expect_local())),
-                            ty.into(),
-                        );
-                    }
-                }
-            }
-            GenericParamDefKind::Const { .. } => {
-                if is_our_default(param) {
-                    // FIXME(const_generics_defaults): This
-                    // is incorrect when dealing with unused args, for example
-                    // for `struct Foo<const N: usize, const M: usize = { 1 - 2 }>`
-                    // we should eagerly error.
-                    let default_ct = tcx.const_param_default(param.def_id).instantiate_identity();
-                    if !default_ct.has_param() {
-                        wfcx.register_wf_obligation(
-                            tcx.def_span(param.def_id),
-                            None,
-                            default_ct.into(),
-                        );
-                    }
-                }
+        if let Some(default) = param.default_value(tcx).map(ty::EarlyBinder::instantiate_identity) {
+            // Ignore dependent defaults -- that is, where the default of one type
+            // parameter includes another (e.g., `<T, U = T>`). In those cases, we can't
+            // be sure if it will error or not as user might always specify the other.
+            // FIXME(generic_const_exprs): This is incorrect when dealing with unused const params.
+            // E.g: `struct Foo<const N: usize, const M: usize = { 1 - 2 }>;`. Here, we should
+            // eagerly error but we don't as we have `ConstKind::Unevaluated(.., [N, M])`.
+            if !default.has_param() {
+                wfcx.register_wf_obligation(
+                    tcx.def_span(param.def_id),
+                    matches!(param.kind, GenericParamDefKind::Type { .. })
+                        .then(|| WellFormedLoc::Ty(param.def_id.expect_local())),
+                    default,
+                );
             }
-            // Doesn't have defaults.
-            GenericParamDefKind::Lifetime => {}
         }
     }
 
@@ -1490,39 +1461,16 @@ fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id
     //
     // First we build the defaulted generic parameters.
     let args = GenericArgs::for_item(tcx, def_id.to_def_id(), |param, _| {
-        match param.kind {
-            GenericParamDefKind::Lifetime => {
-                // All regions are identity.
-                tcx.mk_param_from_def(param)
-            }
-
-            GenericParamDefKind::Type { .. } => {
-                // If the param has a default, ...
-                if is_our_default(param) {
-                    let default_ty = tcx.type_of(param.def_id).instantiate_identity();
-                    // ... and it's not a dependent default, ...
-                    if !default_ty.has_param() {
-                        // ... then instantiate it with the default.
-                        return default_ty.into();
-                    }
-                }
-
-                tcx.mk_param_from_def(param)
-            }
-            GenericParamDefKind::Const { .. } => {
-                // If the param has a default, ...
-                if is_our_default(param) {
-                    let default_ct = tcx.const_param_default(param.def_id).instantiate_identity();
-                    // ... and it's not a dependent default, ...
-                    if !default_ct.has_param() {
-                        // ... then instantiate it with the default.
-                        return default_ct.into();
-                    }
-                }
-
-                tcx.mk_param_from_def(param)
-            }
+        if param.index >= generics.parent_count as u32
+            // If the param has a default, ...
+            && let Some(default) = param.default_value(tcx).map(ty::EarlyBinder::instantiate_identity)
+            // ... and it's not a dependent default, ...
+            && !default.has_param()
+        {
+            // ... then instantiate it with the default.
+            return default;
         }
+        tcx.mk_param_from_def(param)
     });
 
     // Now we build the instantiated predicates.

compiler/rustc_hir_typeck/src/_match.rs

@@ -15,7 +15,7 @@ use crate::{Diverges, Expectation, FnCtxt, Needs};
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     #[instrument(skip(self), level = "debug", ret)]
-    pub(crate) fn check_match(
+    pub(crate) fn check_expr_match(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         scrut: &'tcx hir::Expr<'tcx>,

compiler/rustc_hir_typeck/src/callee.rs

@@ -62,7 +62,7 @@ enum CallStep<'tcx> {
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
-    pub(crate) fn check_call(
+    pub(crate) fn check_expr_call(
         &self,
         call_expr: &'tcx hir::Expr<'tcx>,
         callee_expr: &'tcx hir::Expr<'tcx>,
@@ -74,8 +74,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 .check_expr_with_expectation_and_args(
                     callee_expr,
                     Expectation::NoExpectation,
-                    arg_exprs,
-                    Some(call_expr),
+                    Some((call_expr, arg_exprs)),
                 ),
             _ => self.check_expr(callee_expr),
         };

compiler/rustc_hir_typeck/src/check.rs

@@ -137,7 +137,7 @@ pub(super) fn check_fn<'a, 'tcx>(
     }
 
     fcx.is_whole_body.set(true);
-    fcx.check_return_expr(body.value, false);
+    fcx.check_return_or_body_tail(body.value, false);
 
     // Finalize the return check by taking the LUB of the return types
     // we saw and assigning it to the expected return type. This isn't

compiler/rustc_hir_typeck/src/expr.rs

@@ -55,6 +55,9 @@ use crate::{
 };
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
+    /// Check an expr with an expectation type, and also demand that the expr's
+    /// evaluated type is a subtype of the expectation at the end. This is a
+    /// *hard* requirement.
     pub(crate) fn check_expr_has_type_or_error(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
@@ -97,6 +100,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         ty
     }
 
+    /// Check an expr with an expectation type, and also demand that the expr's
+    /// evaluated type is a coercible to the expectation at the end. This is a
+    /// *hard* requirement.
     pub(super) fn check_expr_coercible_to_type(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
@@ -128,6 +134,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
+    /// Check an expr with an expectation type. Don't actually enforce that expectation
+    /// is related to the expr's evaluated type via subtyping or coercion. This is
+    /// usually called because we want to do that subtype/coerce call manually for better
+    /// diagnostics.
     pub(super) fn check_expr_with_hint(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
@@ -136,6 +146,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.check_expr_with_expectation(expr, ExpectHasType(expected))
     }
 
+    /// Check an expr with an expectation type, and also [`Needs`] which will
+    /// prompt typeck to convert any implicit immutable derefs to mutable derefs.
     fn check_expr_with_expectation_and_needs(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
@@ -153,10 +165,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         ty
     }
 
+    /// Check an expr with no expectations.
     pub(super) fn check_expr(&self, expr: &'tcx hir::Expr<'tcx>) -> Ty<'tcx> {
         self.check_expr_with_expectation(expr, NoExpectation)
     }
 
+    /// Check an expr with no expectations, but with [`Needs`] which will
+    /// prompt typeck to convert any implicit immutable derefs to mutable derefs.
     pub(super) fn check_expr_with_needs(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
@@ -165,33 +180,26 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.check_expr_with_expectation_and_needs(expr, NoExpectation, needs)
     }
 
-    /// Invariant:
-    /// If an expression has any sub-expressions that result in a type error,
-    /// inspecting that expression's type with `ty.references_error()` will return
-    /// true. Likewise, if an expression is known to diverge, inspecting its
-    /// type with `ty::type_is_bot` will return true (n.b.: since Rust is
-    /// strict, _|_ can appear in the type of an expression that does not,
-    /// itself, diverge: for example, fn() -> _|_.)
-    /// Note that inspecting a type's structure *directly* may expose the fact
-    /// that there are actually multiple representations for `Error`, so avoid
-    /// that when err needs to be handled differently.
+    /// Check an expr with an expectation type which may be used to eagerly
+    /// guide inference when evaluating that expr.
     #[instrument(skip(self, expr), level = "debug")]
     pub(super) fn check_expr_with_expectation(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         expected: Expectation<'tcx>,
     ) -> Ty<'tcx> {
-        self.check_expr_with_expectation_and_args(expr, expected, &[], None)
+        self.check_expr_with_expectation_and_args(expr, expected, None)
     }
 
-    /// Same as `check_expr_with_expectation`, but allows us to pass in the arguments of a
-    /// `ExprKind::Call` when evaluating its callee when it is an `ExprKind::Path`.
+    /// Same as [`Self::check_expr_with_expectation`], but allows us to pass in
+    /// the arguments of a [`ExprKind::Call`] when evaluating its callee that
+    /// is an [`ExprKind::Path`]. We use this to refine the spans for certain
+    /// well-formedness guarantees for the path expr.
     pub(super) fn check_expr_with_expectation_and_args(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         expected: Expectation<'tcx>,
-        args: &'tcx [hir::Expr<'tcx>],
-        call: Option<&'tcx hir::Expr<'tcx>>,
+        call_expr_and_args: Option<(&'tcx hir::Expr<'tcx>, &'tcx [hir::Expr<'tcx>])>,
     ) -> Ty<'tcx> {
         if self.tcx().sess.verbose_internals() {
             // make this code only run with -Zverbose-internals because it is probably slow
@@ -236,9 +244,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         };
 
         let ty = ensure_sufficient_stack(|| match &expr.kind {
+            // Intercept the callee path expr and give it better spans.
             hir::ExprKind::Path(
                 qpath @ (hir::QPath::Resolved(..) | hir::QPath::TypeRelative(..)),
-            ) => self.check_expr_path(qpath, expr, Some(args), call),
+            ) => self.check_expr_path(qpath, expr, call_expr_and_args),
             _ => self.check_expr_kind(expr, expected),
         });
         let ty = self.resolve_vars_if_possible(ty);
@@ -472,28 +481,30 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         let tcx = self.tcx;
         match expr.kind {
-            ExprKind::Lit(ref lit) => self.check_lit(lit, expected),
-            ExprKind::Binary(op, lhs, rhs) => self.check_binop(expr, op, lhs, rhs, expected),
+            ExprKind::Lit(ref lit) => self.check_expr_lit(lit, expected),
+            ExprKind::Binary(op, lhs, rhs) => self.check_expr_binop(expr, op, lhs, rhs, expected),
             ExprKind::Assign(lhs, rhs, span) => {
                 self.check_expr_assign(expr, expected, lhs, rhs, span)
             }
             ExprKind::AssignOp(op, lhs, rhs) => {
-                self.check_binop_assign(expr, op, lhs, rhs, expected)
+                self.check_expr_binop_assign(expr, op, lhs, rhs, expected)
             }
-            ExprKind::Unary(unop, oprnd) => self.check_expr_unary(unop, oprnd, expected, expr),
+            ExprKind::Unary(unop, oprnd) => self.check_expr_unop(unop, oprnd, expected, expr),
             ExprKind::AddrOf(kind, mutbl, oprnd) => {
                 self.check_expr_addr_of(kind, mutbl, oprnd, expected, expr)
             }
             ExprKind::Path(QPath::LangItem(lang_item, _)) => {
                 self.check_lang_item_path(lang_item, expr)
             }
-            ExprKind::Path(ref qpath) => self.check_expr_path(qpath, expr, None, None),
+            ExprKind::Path(ref qpath) => self.check_expr_path(qpath, expr, None),
             ExprKind::InlineAsm(asm) => {
                 // We defer some asm checks as we may not have resolved the input and output types yet (they may still be infer vars).
                 self.deferred_asm_checks.borrow_mut().push((asm, expr.hir_id));
                 self.check_expr_asm(asm)
             }
-            ExprKind::OffsetOf(container, fields) => self.check_offset_of(container, fields, expr),
+            ExprKind::OffsetOf(container, fields) => {
+                self.check_expr_offset_of(container, fields, expr)
+            }
             ExprKind::Break(destination, ref expr_opt) => {
                 self.check_expr_break(destination, expr_opt.as_deref(), expr)
             }
@@ -512,13 +523,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 self.check_expr_loop(body, source, expected, expr)
             }
             ExprKind::Match(discrim, arms, match_src) => {
-                self.check_match(expr, discrim, arms, expected, match_src)
+                self.check_expr_match(expr, discrim, arms, expected, match_src)
             }
             ExprKind::Closure(closure) => self.check_expr_closure(closure, expr.span, expected),
-            ExprKind::Block(body, _) => self.check_block_with_expected(body, expected),
-            ExprKind::Call(callee, args) => self.check_call(expr, callee, args, expected),
+            ExprKind::Block(body, _) => self.check_expr_block(body, expected),
+            ExprKind::Call(callee, args) => self.check_expr_call(expr, callee, args, expected),
             ExprKind::MethodCall(segment, receiver, args, _) => {
-                self.check_method_call(expr, segment, receiver, args, expected)
+                self.check_expr_method_call(expr, segment, receiver, args, expected)
             }
             ExprKind::Cast(e, t) => self.check_expr_cast(e, t, expr),
             ExprKind::Type(e, t) => {
@@ -528,7 +539,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 ascribed_ty
             }
             ExprKind::If(cond, then_expr, opt_else_expr) => {
-                self.check_then_else(cond, then_expr, opt_else_expr, expr.span, expected)
+                self.check_expr_if(cond, then_expr, opt_else_expr, expr.span, expected)
             }
             ExprKind::DropTemps(e) => self.check_expr_with_expectation(e, expected),
             ExprKind::Array(args) => self.check_expr_array(args, expected, expr),
@@ -540,7 +551,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             ExprKind::Struct(qpath, fields, ref base_expr) => {
                 self.check_expr_struct(expr, expected, qpath, fields, base_expr)
             }
-            ExprKind::Field(base, field) => self.check_field(expr, base, field, expected),
+            ExprKind::Field(base, field) => self.check_expr_field(expr, base, field, expected),
             ExprKind::Index(base, idx, brackets_span) => {
                 self.check_expr_index(base, idx, expr, brackets_span)
             }
@@ -549,7 +560,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    fn check_expr_unary(
+    fn check_expr_unop(
         &self,
         unop: hir::UnOp,
         oprnd: &'tcx hir::Expr<'tcx>,
@@ -699,8 +710,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         &self,
         qpath: &'tcx hir::QPath<'tcx>,
         expr: &'tcx hir::Expr<'tcx>,
-        args: Option<&'tcx [hir::Expr<'tcx>]>,
-        call: Option<&'tcx hir::Expr<'tcx>>,
+        call_expr_and_args: Option<(&'tcx hir::Expr<'tcx>, &'tcx [hir::Expr<'tcx>])>,
     ) -> Ty<'tcx> {
         let tcx = self.tcx;
         let (res, opt_ty, segs) =
@@ -730,7 +740,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     segs,
                     opt_ty,
                     res,
-                    call.map_or(expr.span, |e| e.span),
+                    call_expr_and_args.map_or(expr.span, |(e, _)| e.span),
                     expr.span,
                     expr.hir_id,
                 )
@@ -769,7 +779,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     // We just want to check sizedness, so instead of introducing
                     // placeholder lifetimes with probing, we just replace higher lifetimes
                     // with fresh vars.
-                    let span = args.and_then(|args| args.get(i)).map_or(expr.span, |arg| arg.span);
+                    let span = call_expr_and_args
+                        .and_then(|(_, args)| args.get(i))
+                        .map_or(expr.span, |arg| arg.span);
                     let input = self.instantiate_binder_with_fresh_vars(
                         span,
                         infer::BoundRegionConversionTime::FnCall,
@@ -795,7 +807,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             );
             self.require_type_is_sized_deferred(
                 output,
-                call.map_or(expr.span, |e| e.span),
+                call_expr_and_args.map_or(expr.span, |(e, _)| e.span),
                 ObligationCauseCode::SizedCallReturnType,
             );
         }
@@ -972,7 +984,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             if self.ret_coercion_span.get().is_none() {
                 self.ret_coercion_span.set(Some(e.span));
             }
-            self.check_return_expr(e, true);
+            self.check_return_or_body_tail(e, true);
         } else {
             let mut coercion = self.ret_coercion.as_ref().unwrap().borrow_mut();
             if self.ret_coercion_span.get().is_none() {
@@ -1035,7 +1047,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     ///
     /// `explicit_return` is `true` if we're checking an explicit `return expr`,
     /// and `false` if we're checking a trailing expression.
-    pub(super) fn check_return_expr(
+    pub(super) fn check_return_or_body_tail(
         &self,
         return_expr: &'tcx hir::Expr<'tcx>,
         explicit_return: bool,
@@ -1259,7 +1271,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     // A generic function for checking the 'then' and 'else' clauses in an 'if'
     // or 'if-else' expression.
-    fn check_then_else(
+    fn check_expr_if(
         &self,
         cond_expr: &'tcx hir::Expr<'tcx>,
         then_expr: &'tcx hir::Expr<'tcx>,
@@ -1542,7 +1554,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Checks a method call.
-    fn check_method_call(
+    fn check_expr_method_call(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         segment: &'tcx hir::PathSegment<'tcx>,
@@ -2594,7 +2606,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     // Check field access expressions
-    fn check_field(
+    fn check_expr_field(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         base: &'tcx hir::Expr<'tcx>,
@@ -3535,8 +3547,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     let previous_diverges = self.diverges.get();
 
                     // The label blocks should have unit return value or diverge.
-                    let ty =
-                        self.check_block_with_expected(block, ExpectHasType(self.tcx.types.unit));
+                    let ty = self.check_expr_block(block, ExpectHasType(self.tcx.types.unit));
                     if !ty.is_never() {
                         self.demand_suptype(block.span, self.tcx.types.unit, ty);
                         diverge = false;
@@ -3551,7 +3562,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         if diverge { self.tcx.types.never } else { self.tcx.types.unit }
     }
 
-    fn check_offset_of(
+    fn check_expr_offset_of(
         &self,
         container: &'tcx hir::Ty<'tcx>,
         fields: &[Ident],

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -1306,30 +1306,16 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             rustc_hir_analysis::hir_ty_lowering::RegionInferReason::Param(param),
                         )
                         .into(),
-                    GenericParamDefKind::Type { has_default, .. } => {
-                        if !infer_args && has_default {
-                            // If we have a default, then it doesn't matter that we're not
-                            // inferring the type arguments: we provide the default where any
-                            // is missing.
-                            tcx.type_of(param.def_id).instantiate(tcx, preceding_args).into()
-                        } else {
-                            // If no type arguments were provided, we have to infer them.
-                            // This case also occurs as a result of some malformed input, e.g.
-                            // a lifetime argument being given instead of a type parameter.
-                            // Using inference instead of `Error` gives better error messages.
-                            self.fcx.var_for_def(self.span, param)
+                    GenericParamDefKind::Type { .. } | GenericParamDefKind::Const { .. } => {
+                        if !infer_args && let Some(default) = param.default_value(tcx) {
+                            // If we have a default, then it doesn't matter that we're not inferring
+                            // the type/const arguments: We provide the default where any is missing.
+                            return default.instantiate(tcx, preceding_args);
                         }
-                    }
-                    GenericParamDefKind::Const { has_default, .. } => {
-                        if has_default {
-                            if !infer_args {
-                                return tcx
-                                    .const_param_default(param.def_id)
-                                    .instantiate(tcx, preceding_args)
-                                    .into();
-                            }
-                        }
-
+                        // If no type/const arguments were provided, we have to infer them.
+                        // This case also occurs as a result of some malformed input, e.g.,
+                        // a lifetime argument being given instead of a type/const parameter.
+                        // Using inference instead of `Error` gives better error messages.
                         self.fcx.var_for_def(self.span, param)
                     }
                 }

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -1565,7 +1565,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     // AST fragment checking
-    pub(in super::super) fn check_lit(
+    pub(in super::super) fn check_expr_lit(
         &self,
         lit: &hir::Lit,
         expected: Expectation<'tcx>,
@@ -1747,7 +1747,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         if let Some(blk) = decl.origin.try_get_else() {
             let previous_diverges = self.diverges.get();
-            let else_ty = self.check_block_with_expected(blk, NoExpectation);
+            let else_ty = self.check_expr_block(blk, NoExpectation);
             let cause = self.cause(blk.span, ObligationCauseCode::LetElse);
             if let Err(err) = self.demand_eqtype_with_origin(&cause, self.tcx.types.never, else_ty)
             {
@@ -1805,7 +1805,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     pub(crate) fn check_block_no_value(&self, blk: &'tcx hir::Block<'tcx>) {
         let unit = self.tcx.types.unit;
-        let ty = self.check_block_with_expected(blk, ExpectHasType(unit));
+        let ty = self.check_expr_block(blk, ExpectHasType(unit));
 
         // if the block produces a `!` value, that can always be
         // (effectively) coerced to unit.
@@ -1814,7 +1814,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub(in super::super) fn check_block_with_expected(
+    pub(in super::super) fn check_expr_block(
         &self,
         blk: &'tcx hir::Block<'tcx>,
         expected: Expectation<'tcx>,

compiler/rustc_hir_typeck/src/op.rs

@@ -26,7 +26,7 @@ use crate::Expectation;
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// Checks a `a <op>= b`
-    pub(crate) fn check_binop_assign(
+    pub(crate) fn check_expr_binop_assign(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         op: hir::BinOp,
@@ -85,7 +85,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Checks a potentially overloaded binary operator.
-    pub(crate) fn check_binop(
+    pub(crate) fn check_expr_binop(
         &self,
         expr: &'tcx hir::Expr<'tcx>,
         op: hir::BinOp,

compiler/rustc_middle/src/ty/generics.rs

@@ -86,10 +86,10 @@ impl GenericParamDef {
         tcx: TyCtxt<'tcx>,
     ) -> Option<EarlyBinder<'tcx, ty::GenericArg<'tcx>>> {
         match self.kind {
-            GenericParamDefKind::Type { has_default, .. } if has_default => {
+            GenericParamDefKind::Type { has_default: true, .. } => {
                 Some(tcx.type_of(self.def_id).map_bound(|t| t.into()))
             }
-            GenericParamDefKind::Const { has_default, .. } if has_default => {
+            GenericParamDefKind::Const { has_default: true, .. } => {
                 Some(tcx.const_param_default(self.def_id).map_bound(|c| c.into()))
             }
             _ => None,

compiler/rustc_privacy/src/lib.rs

@@ -782,21 +782,11 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> {
 impl ReachEverythingInTheInterfaceVisitor<'_, '_> {
     fn generics(&mut self) -> &mut Self {
         for param in &self.ev.tcx.generics_of(self.item_def_id).own_params {
-            match param.kind {
-                GenericParamDefKind::Lifetime => {}
-                GenericParamDefKind::Type { has_default, .. } => {
-                    if has_default {
-                        self.visit(self.ev.tcx.type_of(param.def_id).instantiate_identity());
-                    }
-                }
-                GenericParamDefKind::Const { has_default, .. } => {
-                    self.visit(self.ev.tcx.type_of(param.def_id).instantiate_identity());
-                    if has_default {
-                        self.visit(
-                            self.ev.tcx.const_param_default(param.def_id).instantiate_identity(),
-                        );
-                    }
-                }
+            if let GenericParamDefKind::Const { .. } = param.kind {
+                self.visit(self.ev.tcx.type_of(param.def_id).instantiate_identity());
+            }
+            if let Some(default) = param.default_value(self.ev.tcx) {
+                self.visit(default.instantiate_identity());
             }
         }
         self

compiler/rustc_session/src/options.rs

@@ -130,7 +130,7 @@ top_level_options!(
     pub struct Options {
         /// The crate config requested for the session, which may be combined
         /// with additional crate configurations during the compile process.
-        #[rustc_lint_opt_deny_field_access("use `Session::crate_types` instead of this field")]
+        #[rustc_lint_opt_deny_field_access("use `TyCtxt::crate_types` instead of this field")]
         crate_types: Vec<CrateType> [TRACKED],
         optimize: OptLevel [TRACKED],
         /// Include the `debug_assertions` flag in dependency tracking, since it

compiler/rustc_span/src/symbol.rs

@@ -1568,6 +1568,8 @@ symbols! {
         readonly,
         realloc,
         reason,
+        receiver,
+        receiver_target,
         recursion_limit,
         reexport_test_harness_main,
         ref_pat_eat_one_layer_2024,

library/core/src/ops/deref.rs

@@ -294,14 +294,98 @@ unsafe impl<T: ?Sized> DerefPure for &T {}
 #[unstable(feature = "deref_pure_trait", issue = "87121")]
 unsafe impl<T: ?Sized> DerefPure for &mut T {}
 
+/// Indicates that a struct can be used as a method receiver.
+/// That is, a type can use this type as a type of `self`, like this:
+/// ```compile_fail
+/// # // This is currently compile_fail because the compiler-side parts
+/// # // of arbitrary_self_types are not implemented
+/// use std::ops::Receiver;
+///
+/// struct SmartPointer<T>(T);
+///
+/// impl<T> Receiver for SmartPointer<T> {
+///    type Target = T;
+/// }
+///
+/// struct MyContainedType;
+///
+/// impl MyContainedType {
+///   fn method(self: SmartPointer<Self>) {
+///     // ...
+///   }
+/// }
+///
+/// fn main() {
+///   let ptr = SmartPointer(MyContainedType);
+///   ptr.method();
+/// }
+/// ```
+/// This trait is blanket implemented for any type which implements
+/// [`Deref`], which includes stdlib pointer types like `Box<T>`,`Rc<T>`, `&T`,
+/// and `Pin<P>`. For that reason, it's relatively rare to need to
+/// implement this directly. You'll typically do this only if you need
+/// to implement a smart pointer type which can't implement [`Deref`]; perhaps
+/// because you're interfacing with another programming language and can't
+/// guarantee that references comply with Rust's aliasing rules.
+///
+/// When looking for method candidates, Rust will explore a chain of possible
+/// `Receiver`s, so for example each of the following methods work:
+/// ```
+/// use std::boxed::Box;
+/// use std::rc::Rc;
+///
+/// // Both `Box` and `Rc` (indirectly) implement Receiver
+///
+/// struct MyContainedType;
+///
+/// fn main() {
+///   let t = Rc::new(Box::new(MyContainedType));
+///   t.method_a();
+///   t.method_b();
+///   t.method_c();
+/// }
+///
+/// impl MyContainedType {
+///   fn method_a(&self) {
+///
+///   }
+///   fn method_b(self: &Box<Self>) {
+///
+///   }
+///   fn method_c(self: &Rc<Box<Self>>) {
+///
+///   }
+/// }
+/// ```
+#[lang = "receiver"]
+#[cfg(not(bootstrap))]
+#[unstable(feature = "arbitrary_self_types", issue = "44874")]
+pub trait Receiver {
+    /// The target type on which the method may be called.
+    #[cfg(not(bootstrap))]
+    #[rustc_diagnostic_item = "receiver_target"]
+    #[lang = "receiver_target"]
+    #[unstable(feature = "arbitrary_self_types", issue = "44874")]
+    type Target: ?Sized;
+}
+
+#[cfg(not(bootstrap))]
+#[unstable(feature = "arbitrary_self_types", issue = "44874")]
+impl<P: ?Sized, T: ?Sized> Receiver for P
+where
+    P: Deref<Target = T>,
+{
+    type Target = T;
+}
+
 /// Indicates that a struct can be used as a method receiver, without the
 /// `arbitrary_self_types` feature. This is implemented by stdlib pointer types like `Box<T>`,
 /// `Rc<T>`, `&T`, and `Pin<P>`.
 ///
 /// This trait will shortly be removed and replaced with a more generic
 /// facility based around the current "arbitrary self types" unstable feature.
-/// That new facility will use a replacement trait called `Receiver` which is
-/// why this is now named `LegacyReceiver`.
+/// That new facility will use the replacement trait above called `Receiver`
+/// which is why this is now named `LegacyReceiver`.
 #[cfg_attr(bootstrap, lang = "receiver")]
 #[cfg_attr(not(bootstrap), lang = "legacy_receiver")]
 #[unstable(feature = "legacy_receiver_trait", issue = "none")]

library/core/src/ops/mod.rs

@@ -170,6 +170,9 @@ pub use self::coroutine::{Coroutine, CoroutineState};
 pub use self::deref::DerefPure;
 #[unstable(feature = "legacy_receiver_trait", issue = "none")]
 pub use self::deref::LegacyReceiver;
+#[unstable(feature = "arbitrary_self_types", issue = "44874")]
+#[cfg(not(bootstrap))]
+pub use self::deref::Receiver;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::deref::{Deref, DerefMut};
 #[stable(feature = "rust1", since = "1.0.0")]

tests/ui-fulldeps/internal-lints/bad_opt_access.rs

@@ -15,7 +15,7 @@ pub fn access_bad_option(sess: Session) {
     //~^ ERROR use `Session::split_debuginfo` instead of this field
 
     let _ = sess.opts.crate_types;
-    //~^ ERROR use `Session::crate_types` instead of this field
+    //~^ ERROR use `TyCtxt::crate_types` instead of this field
 
     let _ = sess.opts.crate_name;
     // okay!

tests/ui-fulldeps/internal-lints/bad_opt_access.stderr

@@ -10,7 +10,7 @@ note: the lint level is defined here
 LL | #![deny(rustc::bad_opt_access)]
    |         ^^^^^^^^^^^^^^^^^^^^^
 
-error: use `Session::crate_types` instead of this field
+error: use `TyCtxt::crate_types` instead of this field
   --> $DIR/bad_opt_access.rs:17:13
    |
 LL |     let _ = sess.opts.crate_types;

triagebot.toml

@@ -212,6 +212,10 @@ trigger_files = [
     "src/tools/rustdoc-gui",
     "src/tools/rustdoc-js",
     "src/tools/rustdoc-themes",
+
+    # Docs
+    "src/doc/rustdoc.md",
+    "src/doc/rustdoc/",
 ]
 exclude_labels = [
     "T-*",
@@ -971,7 +975,6 @@ cc = ["@kobzol"]
 warn_non_default_branch = true
 contributing_url = "https://rustc-dev-guide.rust-lang.org/getting-started.html"
 users_on_vacation = [
-    "fmease",
     "jieyouxu",
     "jyn514",
     "oli-obk",