Auto merge of rust-lang#85664 - GuillaumeGomez:rollup-o7qgo8c, r=GuillaumeGomez

Rollup of 6 pull requests

Successful merges:

 - rust-lang#85361 (Use TargetTriple::from_path in rustdoc)
 - rust-lang#85605 (Replace Local::new(1) with CAPTURE_STRUCT_LOCAL)
 - rust-lang#85631 (Move keyword primitive css dom)
 - rust-lang#85644 (Better English for documenting when to use unimplemented!())
 - rust-lang#85650 (Add some backticks to the `rustc_middle::ty::adjustment::Adjustment` docs)
 - rust-lang#85657 (Remove doubled braces in non_exhaustive structs’ documentation text.)

Failed merges:

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

Author: bors

compiler/rustc_middle/src/ty/adjustment.rs

@@ -47,7 +47,7 @@ pub enum PointerCast {
 /// 1. The simplest cases are where a pointer is not adjusted fat vs thin.
 ///    Here the pointer will be dereferenced N times (where a dereference can
 ///    happen to raw or borrowed pointers or any smart pointer which implements
-///    Deref, including Box<_>). The types of dereferences is given by
+///    `Deref`, including `Box<_>`). The types of dereferences is given by
 ///    `autoderefs`. It can then be auto-referenced zero or one times, indicated
 ///    by `autoref`, to either a raw or borrowed pointer. In these cases unsize is
 ///    `false`.
@@ -56,7 +56,7 @@ pub enum PointerCast {
 ///    with a thin pointer, deref a number of times, unsize the underlying data,
 ///    then autoref. The 'unsize' phase may change a fixed length array to a
 ///    dynamically sized one, a concrete object to a trait object, or statically
-///    sized struct to a dynamically sized one. E.g., &[i32; 4] -> &[i32] is
+///    sized struct to a dynamically sized one. E.g., `&[i32; 4]` -> `&[i32]` is
 ///    represented by:
 ///
 ///    ```
@@ -66,7 +66,7 @@ pub enum PointerCast {
 ///    ```
 ///
 ///    Note that for a struct, the 'deep' unsizing of the struct is not recorded.
-///    E.g., `struct Foo<T> { x: T }` we can coerce &Foo<[i32; 4]> to &Foo<[i32]>
+///    E.g., `struct Foo<T> { x: T }` we can coerce `&Foo<[i32; 4]>` to `&Foo<[i32]>`
 ///    The autoderef and -ref are the same as in the above example, but the type
 ///    stored in `unsize` is `Foo<[i32]>`, we don't store any further detail about
 ///    the underlying conversions from `[i32; 4]` to `[i32]`.
@@ -75,8 +75,8 @@ pub enum PointerCast {
 ///    that case, we have the pointer we need coming in, so there are no
 ///    autoderefs, and no autoref. Instead we just do the `Unsize` transformation.
 ///    At some point, of course, `Box` should move out of the compiler, in which
-///    case this is analogous to transforming a struct. E.g., Box<[i32; 4]> ->
-///    Box<[i32]> is an `Adjust::Unsize` with the target `Box<[i32]>`.
+///    case this is analogous to transforming a struct. E.g., `Box<[i32; 4]>` ->
+///    `Box<[i32]>` is an `Adjust::Unsize` with the target `Box<[i32]>`.
 #[derive(Clone, TyEncodable, TyDecodable, HashStable, TypeFoldable)]
 pub struct Adjustment<'tcx> {
     pub kind: Adjust<'tcx>,

compiler/rustc_middle/src/ty/closure.rs

@@ -1,7 +1,7 @@
 use crate::hir::place::{
     Place as HirPlace, PlaceBase as HirPlaceBase, ProjectionKind as HirProjectionKind,
 };
-use crate::ty;
+use crate::{mir, ty};
 
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
 use rustc_hir as hir;
@@ -12,6 +12,10 @@ use super::{Ty, TyCtxt};
 
 use self::BorrowKind::*;
 
+// Captures are represented using fields inside a structure.
+// This represents accessing self in the closure structure
+pub const CAPTURE_STRUCT_LOCAL: mir::Local = mir::Local::from_u32(1);
+
 #[derive(
     Clone,
     Copy,

compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs

@@ -4,10 +4,9 @@ use rustc_errors::{Applicability, DiagnosticBuilder};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{AsyncGeneratorKind, GeneratorKind};
-use rustc_index::vec::Idx;
 use rustc_middle::mir::{
     self, AggregateKind, BindingForm, BorrowKind, ClearCrossCrate, ConstraintCategory,
-    FakeReadCause, Local, LocalDecl, LocalInfo, LocalKind, Location, Operand, Place, PlaceRef,
+    FakeReadCause, LocalDecl, LocalInfo, LocalKind, Location, Operand, Place, PlaceRef,
     ProjectionElem, Rvalue, Statement, StatementKind, Terminator, TerminatorKind, VarBindingForm,
 };
 use rustc_middle::ty::{self, suggest_constraining_type_param, Ty, TypeFoldable};
@@ -1274,7 +1273,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         bug!("temporary or return pointer with a name")
                     }
                     LocalKind::Var => "local variable ",
-                    LocalKind::Arg if !self.upvars.is_empty() && local == Local::new(1) => {
+                    LocalKind::Arg
+                        if !self.upvars.is_empty() && local == ty::CAPTURE_STRUCT_LOCAL =>
+                    {
                         "variable captured by `move` "
                     }
                     LocalKind::Arg => "function parameter ",

compiler/rustc_mir/src/borrow_check/diagnostics/mutability_errors.rs

@@ -1,6 +1,5 @@
 use rustc_hir as hir;
 use rustc_hir::Node;
-use rustc_index::vec::Idx;
 use rustc_middle::hir::map::Map;
 use rustc_middle::mir::{Mutability, Place, PlaceRef, ProjectionElem};
 use rustc_middle::ty::{self, Ty, TyCtxt};
@@ -115,12 +114,14 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 }
             }
             PlaceRef { local: _, projection: [proj_base @ .., ProjectionElem::Deref] } => {
-                if the_place_err.local == Local::new(1)
+                if the_place_err.local == ty::CAPTURE_STRUCT_LOCAL
                     && proj_base.is_empty()
                     && !self.upvars.is_empty()
                 {
                     item_msg = format!("`{}`", access_place_desc.unwrap());
-                    debug_assert!(self.body.local_decls[Local::new(1)].ty.is_region_ptr());
+                    debug_assert!(
+                        self.body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty.is_region_ptr()
+                    );
                     debug_assert!(is_closure_or_generator(
                         Place::ty_from(
                             the_place_err.local,
@@ -478,11 +479,9 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 }
             }
 
-            PlaceRef {
-                local,
-                projection: [ProjectionElem::Deref],
-                // FIXME document what is this 1 magic number about
-            } if local == Local::new(1) && !self.upvars.is_empty() => {
+            PlaceRef { local, projection: [ProjectionElem::Deref] }
+                if local == ty::CAPTURE_STRUCT_LOCAL && !self.upvars.is_empty() =>
+            {
                 self.expected_fn_found_fn_mut_call(&mut err, span, act);
             }
 

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -209,9 +209,7 @@ fn to_upvars_resolved_place_builder<'a, 'tcx>(
     match from_builder.base {
         PlaceBase::Local(_) => Ok(from_builder),
         PlaceBase::Upvar { var_hir_id, closure_def_id, closure_kind } => {
-            // Captures are represented using fields inside a structure.
-            // This represents accessing self in the closure structure
-            let mut upvar_resolved_place_builder = PlaceBuilder::from(Local::new(1));
+            let mut upvar_resolved_place_builder = PlaceBuilder::from(ty::CAPTURE_STRUCT_LOCAL);
             match closure_kind {
                 ty::ClosureKind::Fn | ty::ClosureKind::FnMut => {
                     upvar_resolved_place_builder = upvar_resolved_place_builder.deref();

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -446,7 +446,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     } => {
                         // Not in a closure
                         debug_assert!(
-                            local == Local::new(1),
+                            local == ty::CAPTURE_STRUCT_LOCAL,
                             "Expected local to be Local(1), found {:?}",
                             local
                         );

compiler/rustc_mir_build/src/build/mod.rs

@@ -953,9 +953,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         // the given closure and use the necessary information to create upvar
         // debuginfo and to fill `self.upvar_mutbls`.
         if hir_typeck_results.closure_min_captures.get(&fn_def_id).is_some() {
-            let closure_env_arg = Local::new(1);
             let mut closure_env_projs = vec![];
-            let mut closure_ty = self.local_decls[closure_env_arg].ty;
+            let mut closure_ty = self.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty;
             if let ty::Ref(_, ty, _) = closure_ty.kind() {
                 closure_env_projs.push(ProjectionElem::Deref);
                 closure_ty = ty;
@@ -1001,7 +1000,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                         name,
                         source_info: SourceInfo::outermost(tcx_hir.span(var_id)),
                         value: VarDebugInfoContents::Place(Place {
-                            local: closure_env_arg,
+                            local: ty::CAPTURE_STRUCT_LOCAL,
                             projection: tcx.intern_place_elems(&projs),
                         }),
                     });

compiler/rustc_session/src/config.rs

@@ -1507,7 +1507,10 @@ fn collect_print_requests(
     prints
 }
 
-fn parse_target_triple(matches: &getopts::Matches, error_format: ErrorOutputType) -> TargetTriple {
+pub fn parse_target_triple(
+    matches: &getopts::Matches,
+    error_format: ErrorOutputType,
+) -> TargetTriple {
     match matches.opt_str("target") {
         Some(target) if target.ends_with(".json") => {
             let path = Path::new(&target);

library/core/src/macros/mod.rs

@@ -595,7 +595,7 @@ macro_rules! unreachable {
 /// Indicates unimplemented code by panicking with a message of "not implemented".
 ///
 /// This allows your code to type-check, which is useful if you are prototyping or
-/// implementing a trait that requires multiple methods which you don't plan of using all of.
+/// implementing a trait that requires multiple methods which you don't plan to use all of.
 ///
 /// The difference between `unimplemented!` and [`todo!`] is that while `todo!`
 /// conveys an intent of implementing the functionality later and the message is "not yet

src/librustdoc/config.rs

@@ -6,8 +6,10 @@ use std::path::PathBuf;
 use std::str::FromStr;
 
 use rustc_data_structures::fx::FxHashMap;
-use rustc_session::config::{self, parse_crate_types_from_list, parse_externs, CrateType};
-use rustc_session::config::{get_cmd_lint_options, host_triple, nightly_options};
+use rustc_session::config::{
+    self, parse_crate_types_from_list, parse_externs, parse_target_triple, CrateType,
+};
+use rustc_session::config::{get_cmd_lint_options, nightly_options};
 use rustc_session::config::{CodegenOptions, DebuggingOptions, ErrorOutputType, Externs};
 use rustc_session::getopts;
 use rustc_session::lint::Level;
@@ -562,14 +564,7 @@ impl Options {
             }
         }
 
-        let target =
-            matches.opt_str("target").map_or(TargetTriple::from_triple(host_triple()), |target| {
-                if target.ends_with(".json") {
-                    TargetTriple::TargetPath(PathBuf::from(target))
-                } else {
-                    TargetTriple::TargetTriple(target)
-                }
-            });
+        let target = parse_target_triple(matches, error_format);
 
         let show_coverage = matches.opt_present("show-coverage");