Auto merge of rust-lang#127892 - tgross35:rollup-7j9wkzc, r=tgross35

Rollup of 9 pull requests

Successful merges:

 - rust-lang#127542 ([`macro_metavar_expr_concat`] Add support for literals)
 - rust-lang#127652 (Unignore cg_gcc fmt)
 - rust-lang#127664 (Fix precise capturing suggestion for hidden regions when we have APITs)
 - rust-lang#127806 (Some parser improvements)
 - rust-lang#127828 (Commonize `uname -m` results for `aarch64` in docker runner)
 - rust-lang#127845 (unix: break `stack_overflow::install_main_guard` into smaller fn)
 - rust-lang#127859 (ptr::metadata: avoid references to extern types)
 - rust-lang#127861 (Document the column numbers for the dbg! macro)
 - rust-lang#127875 (style-guide: Clarify version-sorting)

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

compiler/rustc_ast/src/token.rs

@@ -699,8 +699,7 @@ impl Token {
         false
     }
 
-    /// Would `maybe_whole_expr` in `parser.rs` return `Ok(..)`?
-    /// That is, is this a pre-parsed expression dropped into the token stream
+    /// Is this a pre-parsed expression dropped into the token stream
     /// (which happens while parsing the result of macro expansion)?
     pub fn is_whole_expr(&self) -> bool {
         if let Interpolated(nt) = &self.kind

compiler/rustc_codegen_gcc/.rustfmt.toml

@@ -1 +1,3 @@
+version = "Two"
 use_small_heuristics = "Max"
+merge_derives = false

compiler/rustc_codegen_gcc/build_system/src/clone_gcc.rs

@@ -34,7 +34,7 @@ impl Args {
                 "--out-path" => match args.next() {
                     Some(path) if !path.is_empty() => out_path = Some(path),
                     _ => {
-                        return Err("Expected an argument after `--out-path`, found nothing".into())
+                        return Err("Expected an argument after `--out-path`, found nothing".into());
                     }
                 },
                 "--help" => {

compiler/rustc_codegen_gcc/build_system/src/config.rs

@@ -54,7 +54,7 @@ impl ConfigFile {
                     config.gcc_path = Some(value.as_str().to_string())
                 }
                 ("gcc-path", _) => {
-                    return failed_config_parsing(config_file, "Expected a string for `gcc-path`")
+                    return failed_config_parsing(config_file, "Expected a string for `gcc-path`");
                 }
                 ("download-gccjit", TomlValue::Boolean(value)) => {
                     config.download_gccjit = Some(*value)
@@ -63,7 +63,7 @@ impl ConfigFile {
                     return failed_config_parsing(
                         config_file,
                         "Expected a boolean for `download-gccjit`",
-                    )
+                    );
                 }
                 _ => return failed_config_parsing(config_file, &format!("Unknown key `{}`", key)),
             }
@@ -73,7 +73,7 @@ impl ConfigFile {
                 return failed_config_parsing(
                     config_file,
                     "At least one of `gcc-path` or `download-gccjit` value must be set",
-                )
+                );
             }
             (Some(_), Some(true)) => {
                 println!(
@@ -144,7 +144,7 @@ impl ConfigInfo {
                 _ => {
                     return Err(
                         "Expected a value after `--target-triple`, found nothing".to_string()
-                    )
+                    );
                 }
             },
             "--out-dir" => match args.next() {
@@ -158,7 +158,7 @@ impl ConfigInfo {
                     self.config_file = Some(arg.to_string());
                 }
                 _ => {
-                    return Err("Expected a value after `--config-file`, found nothing".to_string())
+                    return Err("Expected a value after `--config-file`, found nothing".to_string());
                 }
             },
             "--release-sysroot" => self.sysroot_release_channel = true,
@@ -169,7 +169,7 @@ impl ConfigInfo {
                     self.cg_gcc_path = Some(arg.into());
                 }
                 _ => {
-                    return Err("Expected a value after `--cg_gcc-path`, found nothing".to_string())
+                    return Err("Expected a value after `--cg_gcc-path`, found nothing".to_string());
                 }
             },
             "--use-backend" => match args.next() {
@@ -277,7 +277,7 @@ impl ConfigInfo {
         self.gcc_path = match gcc_path {
             Some(path) => path,
             None => {
-                return Err(format!("missing `gcc-path` value from `{}`", config_file.display(),))
+                return Err(format!("missing `gcc-path` value from `{}`", config_file.display(),));
             }
         };
         Ok(())

compiler/rustc_codegen_gcc/build_system/src/test.rs

@@ -109,7 +109,7 @@ impl TestArg {
                         test_arg.flags.extend_from_slice(&["--features".into(), feature]);
                     }
                     _ => {
-                        return Err("Expected an argument after `--features`, found nothing".into())
+                        return Err("Expected an argument after `--features`, found nothing".into());
                     }
                 },
                 "--use-system-gcc" => {
@@ -458,11 +458,7 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
     .map_err(|error| format!("Failed to retrieve cargo path: {:?}", error))
     .and_then(|cargo| {
         let cargo = cargo.trim().to_owned();
-        if cargo.is_empty() {
-            Err(format!("`cargo` path is empty"))
-        } else {
-            Ok(cargo)
-        }
+        if cargo.is_empty() { Err(format!("`cargo` path is empty")) } else { Ok(cargo) }
     })?;
     let rustc = String::from_utf8(
         run_command_with_env(&[&"rustup", &toolchain, &"which", &"rustc"], rust_dir, Some(env))?
@@ -471,11 +467,7 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
     .map_err(|error| format!("Failed to retrieve rustc path: {:?}", error))
     .and_then(|rustc| {
         let rustc = rustc.trim().to_owned();
-        if rustc.is_empty() {
-            Err(format!("`rustc` path is empty"))
-        } else {
-            Ok(rustc)
-        }
+        if rustc.is_empty() { Err(format!("`rustc` path is empty")) } else { Ok(rustc) }
     })?;
     let llvm_filecheck = match run_command_with_env(
         &[

compiler/rustc_codegen_gcc/build_system/src/utils.rs

@@ -175,11 +175,7 @@ pub fn cargo_install(to_install: &str) -> Result<(), String> {
 pub fn get_os_name() -> Result<String, String> {
     let output = run_command(&[&"uname"], None)?;
     let name = std::str::from_utf8(&output.stdout).unwrap_or("").trim().to_string();
-    if !name.is_empty() {
-        Ok(name)
-    } else {
-        Err("Failed to retrieve the OS name".to_string())
-    }
+    if !name.is_empty() { Ok(name) } else { Err("Failed to retrieve the OS name".to_string()) }
 }
 
 #[derive(Default, PartialEq)]

compiler/rustc_codegen_gcc/src/abi.rs

@@ -26,11 +26,7 @@ impl<'a, 'gcc, 'tcx> AbiBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         } else {
             false
         };
-        if on_stack {
-            param.to_lvalue().get_address(None)
-        } else {
-            param.to_rvalue()
-        }
+        if on_stack { param.to_lvalue().get_address(None) } else { param.to_rvalue() }
     }
 }
 

compiler/rustc_codegen_gcc/src/asm.rs

@@ -858,11 +858,7 @@ fn modifier_to_gcc(
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => modifier,
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg)
         | InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg_low16) => {
-            if modifier == Some('v') {
-                None
-            } else {
-                modifier
-            }
+            if modifier == Some('v') { None } else { modifier }
         }
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::preg) => {
             unreachable!("clobber-only")

compiler/rustc_codegen_gcc/src/builder.rs

@@ -1043,11 +1043,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
                 let llty = place.layout.scalar_pair_element_gcc_type(self, i);
                 let load = self.load(llty, llptr, align);
                 scalar_load_metadata(self, load, scalar);
-                if scalar.is_bool() {
-                    self.trunc(load, self.type_i1())
-                } else {
-                    load
-                }
+                if scalar.is_bool() { self.trunc(load, self.type_i1()) } else { load }
             };
 
             OperandValue::Pair(
@@ -1795,18 +1791,10 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         // This already happens today with u128::MAX = 2^128 - 1 > f32::MAX.
         let int_max = |signed: bool, int_width: u64| -> u128 {
             let shift_amount = 128 - int_width;
-            if signed {
-                i128::MAX as u128 >> shift_amount
-            } else {
-                u128::MAX >> shift_amount
-            }
+            if signed { i128::MAX as u128 >> shift_amount } else { u128::MAX >> shift_amount }
         };
         let int_min = |signed: bool, int_width: u64| -> i128 {
-            if signed {
-                i128::MIN >> (128 - int_width)
-            } else {
-                0
-            }
+            if signed { i128::MIN >> (128 - int_width) } else { 0 }
         };
 
         let compute_clamp_bounds_single = |signed: bool, int_width: u64| -> (u128, u128) {

compiler/rustc_codegen_gcc/src/common.rs

@@ -58,11 +58,7 @@ pub fn type_is_pointer(typ: Type<'_>) -> bool {
 
 impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     fn const_null(&self, typ: Type<'gcc>) -> RValue<'gcc> {
-        if type_is_pointer(typ) {
-            self.context.new_null(typ)
-        } else {
-            self.const_int(typ, 0)
-        }
+        if type_is_pointer(typ) { self.context.new_null(typ) } else { self.const_int(typ, 0) }
     }
 
     fn const_undef(&self, typ: Type<'gcc>) -> RValue<'gcc> {

compiler/rustc_expand/src/mbe/metavar_expr.rs

@@ -119,6 +119,8 @@ impl MetaVarExpr {
     }
 }
 
+/// Indicates what is placed in a `concat` parameter. For example, literals
+/// (`${concat("foo", "bar")}`) or adhoc identifiers (`${concat(foo, bar)}`).
 #[derive(Debug, Decodable, Encodable, PartialEq)]
 pub(crate) enum MetaVarExprConcatElem {
     /// Identifier WITHOUT a preceding dollar sign, which means that this identifier should be

compiler/rustc_expand/src/mbe/transcribe.rs

@@ -6,9 +6,10 @@ use crate::mbe::macro_parser::{NamedMatch, NamedMatch::*};
 use crate::mbe::metavar_expr::{MetaVarExprConcatElem, RAW_IDENT_ERR};
 use crate::mbe::{self, KleeneOp, MetaVarExpr};
 use rustc_ast::mut_visit::{self, MutVisitor};
-use rustc_ast::token::IdentIsRaw;
-use rustc_ast::token::{self, Delimiter, Token, TokenKind};
+use rustc_ast::token::{self, Delimiter, Nonterminal, Token, TokenKind};
+use rustc_ast::token::{IdentIsRaw, Lit, LitKind};
 use rustc_ast::tokenstream::{DelimSpacing, DelimSpan, Spacing, TokenStream, TokenTree};
+use rustc_ast::ExprKind;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{pluralize, Diag, DiagCtxtHandle, PResult};
 use rustc_parse::lexer::nfc_normalize;
@@ -17,7 +18,7 @@ use rustc_session::parse::ParseSess;
 use rustc_session::parse::SymbolGallery;
 use rustc_span::hygiene::{LocalExpnId, Transparency};
 use rustc_span::symbol::{sym, Ident, MacroRulesNormalizedIdent};
-use rustc_span::{with_metavar_spans, Span, SyntaxContext};
+use rustc_span::{with_metavar_spans, Span, Symbol, SyntaxContext};
 use smallvec::{smallvec, SmallVec};
 use std::mem;
 
@@ -691,12 +692,12 @@ fn transcribe_metavar_expr<'a>(
         MetaVarExpr::Concat(ref elements) => {
             let mut concatenated = String::new();
             for element in elements.into_iter() {
-                let string = match element {
-                    MetaVarExprConcatElem::Ident(elem) => elem.to_string(),
-                    MetaVarExprConcatElem::Literal(elem) => elem.as_str().into(),
-                    MetaVarExprConcatElem::Var(elem) => extract_ident(dcx, *elem, interp)?,
+                let symbol = match element {
+                    MetaVarExprConcatElem::Ident(elem) => elem.name,
+                    MetaVarExprConcatElem::Literal(elem) => *elem,
+                    MetaVarExprConcatElem::Var(elem) => extract_var_symbol(dcx, *elem, interp)?,
                 };
-                concatenated.push_str(&string);
+                concatenated.push_str(symbol.as_str());
             }
             let symbol = nfc_normalize(&concatenated);
             let concatenated_span = visited_span();
@@ -750,32 +751,42 @@ fn transcribe_metavar_expr<'a>(
     Ok(())
 }
 
-/// Extracts an identifier that can be originated from a `$var:ident` variable or from a token tree.
-fn extract_ident<'a>(
+/// Extracts an metavariable symbol that can be an identifier, a token tree or a literal.
+fn extract_var_symbol<'a>(
     dcx: DiagCtxtHandle<'a>,
     ident: Ident,
     interp: &FxHashMap<MacroRulesNormalizedIdent, NamedMatch>,
-) -> PResult<'a, String> {
+) -> PResult<'a, Symbol> {
     if let NamedMatch::MatchedSingle(pnr) = matched_from_ident(dcx, ident, interp)? {
         if let ParseNtResult::Ident(nt_ident, is_raw) = pnr {
             if let IdentIsRaw::Yes = is_raw {
                 return Err(dcx.struct_span_err(ident.span, RAW_IDENT_ERR));
             }
-            return Ok(nt_ident.to_string());
+            return Ok(nt_ident.name);
         }
-        if let ParseNtResult::Tt(TokenTree::Token(
-            Token { kind: TokenKind::Ident(token_ident, is_raw), .. },
-            _,
-        )) = pnr
-        {
-            if let IdentIsRaw::Yes = is_raw {
-                return Err(dcx.struct_span_err(ident.span, RAW_IDENT_ERR));
+
+        if let ParseNtResult::Tt(TokenTree::Token(Token { kind, .. }, _)) = pnr {
+            if let TokenKind::Ident(symbol, is_raw) = kind {
+                if let IdentIsRaw::Yes = is_raw {
+                    return Err(dcx.struct_span_err(ident.span, RAW_IDENT_ERR));
+                }
+                return Ok(*symbol);
             }
-            return Ok(token_ident.to_string());
+
+            if let TokenKind::Literal(Lit { kind: LitKind::Str, symbol, suffix: None }) = kind {
+                return Ok(*symbol);
+            }
+        }
+
+        if let ParseNtResult::Nt(nt) = pnr
+            && let Nonterminal::NtLiteral(expr) = &**nt
+            && let ExprKind::Lit(Lit { kind: LitKind::Str, symbol, suffix: None }) = &expr.kind
+        {
+            return Ok(*symbol);
         }
     }
-    Err(dcx.struct_span_err(
-        ident.span,
-        "`${concat(..)}` currently only accepts identifiers or meta-variables as parameters",
-    ))
+    Err(dcx
+        .struct_err("metavariables of `${concat(..)}` must be of type `ident`, `literal` or `tt`")
+        .with_note("currently only string literals are supported")
+        .with_span(ident.span))
 }

compiler/rustc_infer/messages.ftl

@@ -225,6 +225,8 @@ infer_outlives_content = lifetime of reference outlives lifetime of borrowed con
 infer_precise_capturing_existing = add `{$new_lifetime}` to the `use<...>` bound to explicitly capture it
 infer_precise_capturing_new = add a `use<...>` bound to explicitly capture `{$new_lifetime}`
 
+infer_precise_capturing_new_but_apit = add a `use<...>` bound to explicitly capture `{$new_lifetime}` after turning all argument-position `impl Trait` into type parameters, noting that this possibly affects the API of this crate
+
 infer_prlf_defined_with_sub = the lifetime `{$sub_symbol}` defined here...
 infer_prlf_defined_without_sub = the lifetime defined here...
 infer_prlf_known_limitation = this is a known limitation that will be removed in the future (see issue #100013 <https://github.com/rust-lang/rust/issues/100013> for more information)
@@ -387,6 +389,9 @@ infer_type_annotations_needed = {$source_kind ->
     .label = type must be known at this point
 
 infer_types_declared_different = these two types are declared with different lifetimes...
+
+infer_warn_removing_apit_params = you could use a `use<...>` bound to explicitly capture `{$new_lifetime}`, but argument-position `impl Trait`s are not nameable
+
 infer_where_copy_predicates = copy the `where` clause predicates from the trait
 
 infer_where_remove =