Auto merge of #56557 - pietroalbini:rollup, r=pietroalbini

Rollup of 11 pull requests

Successful merges:

 - #56315 (Rustdoc inline macro reexport)
 - #56332 ([rustdoc] Specific crate search)
 - #56362 (Stabilise exhaustive integer patterns)
 - #56426 (libsyntax_pos: A few tweaks)
 - #56441 (rustbuild: Fix issues with compiler docs)
 - #56446 (pass the parameter environment to `traits::find_associated_item`)
 - #56500 (cleanup: remove static lifetimes from consts)
 - #56525 (Avoid extra copy and syscall in std::env::current_exe)
 - #56528 (Remove unused dependency (rustc_lint -> rustc_mir))
 - #56548 (Optimized string FromIterator + Extend impls)
 - #56553 (Don't print the profiling summary to stdout when -Zprofile-json is set)

Failed merges:

r? @ghost

Cargo.lock

@@ -2352,7 +2352,6 @@ dependencies = [
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc 0.0.0",
  "rustc_data_structures 0.0.0",
- "rustc_mir 0.0.0",
  "rustc_target 0.0.0",
  "syntax 0.0.0",
  "syntax_pos 0.0.0",

src/bootstrap/doc.rs

@@ -697,9 +697,6 @@ impl Step for Rustc {
             return;
         }
 
-        // Build libstd docs so that we generate relative links.
-        builder.ensure(Std { stage, target });
-
         // Build rustc.
         builder.ensure(compile::Rustc { compiler, target });
 
@@ -718,12 +715,16 @@ impl Step for Rustc {
 
         // Find dependencies for top level crates.
         let mut compiler_crates = HashSet::new();
-        for root_crate in &["rustc", "rustc_driver", "rustc_codegen_llvm"] {
+        for root_crate in &["rustc_driver", "rustc_codegen_llvm", "rustc_codegen_ssa"] {
             let interned_root_crate = INTERNER.intern_str(root_crate);
             find_compiler_crates(builder, &interned_root_crate, &mut compiler_crates);
         }
 
         for krate in &compiler_crates {
+            // Create all crate output directories first to make sure rustdoc uses
+            // relative links.
+            // FIXME: Cargo should probably do this itself.
+            t!(fs::create_dir_all(out_dir.join(krate)));
             cargo.arg("-p").arg(krate);
         }
 
@@ -797,8 +798,8 @@ impl Step for Rustdoc {
             return;
         }
 
-        // Build libstd docs so that we generate relative links.
-        builder.ensure(Std { stage, target });
+        // Build rustc docs so that we generate relative links.
+        builder.ensure(Rustc { stage, target });
 
         // Build rustdoc.
         builder.ensure(tool::Rustdoc { host: compiler.host });
@@ -822,6 +823,10 @@ impl Step for Rustdoc {
             &[]
         );
 
+        // Only include compiler crates, no dependencies of those, such as `libc`.
+        cargo.arg("--no-deps");
+        cargo.arg("-p").arg("rustdoc");
+
         cargo.env("RUSTDOCFLAGS", "--document-private-items");
         builder.run(&mut cargo);
     }

src/grammar/parser-lalr.y

@@ -741,14 +741,14 @@ fn_anon_params
 ;
 
 fn_params_with_self
-: '(' maybe_mut SELF maybe_ty_ascription maybe_comma_params ')'              { $$ = mk_node("SelfValue", 3, $2, $4, $5); }
+: '(' maybe_mut SELF maybe_ty_ascription maybe_comma_params ')'              { $$ = mk_node("SelfLower", 3, $2, $4, $5); }
 | '(' '&' maybe_mut SELF maybe_ty_ascription maybe_comma_params ')'          { $$ = mk_node("SelfRegion", 3, $3, $5, $6); }
 | '(' '&' lifetime maybe_mut SELF maybe_ty_ascription maybe_comma_params ')' { $$ = mk_node("SelfRegion", 4, $3, $4, $6, $7); }
 | '(' maybe_params ')'                                                       { $$ = mk_node("SelfStatic", 1, $2); }
 ;
 
 fn_anon_params_with_self
-: '(' maybe_mut SELF maybe_ty_ascription maybe_comma_anon_params ')'              { $$ = mk_node("SelfValue", 3, $2, $4, $5); }
+: '(' maybe_mut SELF maybe_ty_ascription maybe_comma_anon_params ')'              { $$ = mk_node("SelfLower", 3, $2, $4, $5); }
 | '(' '&' maybe_mut SELF maybe_ty_ascription maybe_comma_anon_params ')'          { $$ = mk_node("SelfRegion", 3, $3, $5, $6); }
 | '(' '&' lifetime maybe_mut SELF maybe_ty_ascription maybe_comma_anon_params ')' { $$ = mk_node("SelfRegion", 4, $3, $4, $6, $7); }
 | '(' maybe_anon_params ')'                                                       { $$ = mk_node("SelfStatic", 1, $2); }

src/liballoc/string.rs

@@ -577,7 +577,7 @@ impl String {
             return Cow::Borrowed("");
         };
 
-        const REPLACEMENT: &'static str = "\u{FFFD}";
+        const REPLACEMENT: &str = "\u{FFFD}";
 
         let mut res = String::with_capacity(v.len());
         res.push_str(first_valid);
@@ -1732,18 +1732,37 @@ impl<'a> FromIterator<&'a str> for String {
 #[stable(feature = "extend_string", since = "1.4.0")]
 impl FromIterator<String> for String {
     fn from_iter<I: IntoIterator<Item = String>>(iter: I) -> String {
-        let mut buf = String::new();
-        buf.extend(iter);
-        buf
+        let mut iterator = iter.into_iter();
+
+        // Because we're iterating over `String`s, we can avoid at least
+        // one allocation by getting the first string from the iterator
+        // and appending to it all the subsequent strings.
+        match iterator.next() {
+            None => String::new(),
+            Some(mut buf) => {
+                buf.extend(iterator);
+                buf
+            }
+        }
     }
 }
 
 #[stable(feature = "herd_cows", since = "1.19.0")]
 impl<'a> FromIterator<Cow<'a, str>> for String {
     fn from_iter<I: IntoIterator<Item = Cow<'a, str>>>(iter: I) -> String {
-        let mut buf = String::new();
-        buf.extend(iter);
-        buf
+        let mut iterator = iter.into_iter();
+
+        // Because we're iterating over CoWs, we can (potentially) avoid at least
+        // one allocation by getting the first item and appending to it all the
+        // subsequent items.
+        match iterator.next() {
+            None => String::new(),
+            Some(cow) => {
+                let mut buf = cow.into_owned();
+                buf.extend(iterator);
+                buf
+            }
+        }
     }
 }
 
@@ -1753,9 +1772,7 @@ impl Extend<char> for String {
         let iterator = iter.into_iter();
         let (lower_bound, _) = iterator.size_hint();
         self.reserve(lower_bound);
-        for ch in iterator {
-            self.push(ch)
-        }
+        iterator.for_each(move |c| self.push(c));
     }
 }
 
@@ -1769,27 +1786,21 @@ impl<'a> Extend<&'a char> for String {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a> Extend<&'a str> for String {
     fn extend<I: IntoIterator<Item = &'a str>>(&mut self, iter: I) {
-        for s in iter {
-            self.push_str(s)
-        }
+        iter.into_iter().for_each(move |s| self.push_str(s));
     }
 }
 
 #[stable(feature = "extend_string", since = "1.4.0")]
 impl Extend<String> for String {
     fn extend<I: IntoIterator<Item = String>>(&mut self, iter: I) {
-        for s in iter {
-            self.push_str(&s)
-        }
+        iter.into_iter().for_each(move |s| self.push_str(&s));
     }
 }
 
 #[stable(feature = "herd_cows", since = "1.19.0")]
 impl<'a> Extend<Cow<'a, str>> for String {
     fn extend<I: IntoIterator<Item = Cow<'a, str>>>(&mut self, iter: I) {
-        for s in iter {
-            self.push_str(&s)
-        }
+        iter.into_iter().for_each(move |s| self.push_str(&s));
     }
 }
 

src/libcore/fmt/mod.rs

@@ -1381,7 +1381,7 @@ impl<'a> Formatter<'a> {
         for part in formatted.parts {
             match *part {
                 flt2dec::Part::Zero(mut nzeroes) => {
-                    const ZEROES: &'static str = // 64 zeroes
+                    const ZEROES: &str = // 64 zeroes
                         "0000000000000000000000000000000000000000000000000000000000000000";
                     while nzeroes > ZEROES.len() {
                         self.buf.write_str(ZEROES)?;

src/libcore/unicode/printable.rs

@@ -80,7 +80,7 @@ pub(crate) fn is_printable(x: char) -> bool {
     }
 }
 
-const SINGLETONS0U: &'static [(u8, u8)] = &[
+const SINGLETONS0U: &[(u8, u8)] = &[
     (0x00, 1),
     (0x03, 5),
     (0x05, 6),
@@ -122,7 +122,7 @@ const SINGLETONS0U: &'static [(u8, u8)] = &[
     (0xfe, 3),
     (0xff, 9),
 ];
-const SINGLETONS0L: &'static [u8] = &[
+const SINGLETONS0L: &[u8] = &[
     0xad, 0x78, 0x79, 0x8b, 0x8d, 0xa2, 0x30, 0x57,
     0x58, 0x8b, 0x8c, 0x90, 0x1c, 0x1d, 0xdd, 0x0e,
     0x0f, 0x4b, 0x4c, 0xfb, 0xfc, 0x2e, 0x2f, 0x3f,
@@ -162,7 +162,7 @@ const SINGLETONS0L: &'static [u8] = &[
     0x91, 0xfe, 0xff, 0x53, 0x67, 0x75, 0xc8, 0xc9,
     0xd0, 0xd1, 0xd8, 0xd9, 0xe7, 0xfe, 0xff,
 ];
-const SINGLETONS1U: &'static [(u8, u8)] = &[
+const SINGLETONS1U: &[(u8, u8)] = &[
     (0x00, 6),
     (0x01, 1),
     (0x03, 1),
@@ -197,7 +197,7 @@ const SINGLETONS1U: &'static [(u8, u8)] = &[
     (0xf0, 4),
     (0xf9, 4),
 ];
-const SINGLETONS1L: &'static [u8] = &[
+const SINGLETONS1L: &[u8] = &[
     0x0c, 0x27, 0x3b, 0x3e, 0x4e, 0x4f, 0x8f, 0x9e,
     0x9e, 0x9f, 0x06, 0x07, 0x09, 0x36, 0x3d, 0x3e,
     0x56, 0xf3, 0xd0, 0xd1, 0x04, 0x14, 0x18, 0x36,
@@ -219,7 +219,7 @@ const SINGLETONS1L: &'static [u8] = &[
     0x78, 0x7d, 0x7f, 0x8a, 0xa4, 0xaa, 0xaf, 0xb0,
     0xc0, 0xd0, 0x3f, 0x71, 0x72, 0x7b,
 ];
-const NORMAL0: &'static [u8] = &[
+const NORMAL0: &[u8] = &[
     0x00, 0x20,
     0x5f, 0x22,
     0x82, 0xdf, 0x04,
@@ -363,7 +363,7 @@ const NORMAL0: &'static [u8] = &[
     0x1b, 0x03,
     0x0f, 0x0d,
 ];
-const NORMAL1: &'static [u8] = &[
+const NORMAL1: &[u8] = &[
     0x5e, 0x22,
     0x7b, 0x05,
     0x03, 0x04,

src/librustc/dep_graph/dep_node.rs

@@ -381,7 +381,7 @@ macro_rules! define_dep_nodes {
         #[allow(dead_code, non_upper_case_globals)]
         pub mod label_strs {
            $(
-                pub const $variant: &'static str = stringify!($variant);
+                pub const $variant: &str = stringify!($variant);
             )*
         }
     );

src/librustc/hir/lowering.rs

@@ -1201,7 +1201,7 @@ impl<'a> LoweringContext<'a> {
                 None,
                 P(hir::Path {
                     def: self.expect_full_def(t.id),
-                    segments: hir_vec![hir::PathSegment::from_ident(keywords::SelfType.ident())],
+                    segments: hir_vec![hir::PathSegment::from_ident(keywords::SelfUpper.ident())],
                     span: t.span,
                 }),
             )),
@@ -2425,7 +2425,7 @@ impl<'a> LoweringContext<'a> {
                 // Don't expose `Self` (recovered "keyword used as ident" parse error).
                 // `rustc::ty` expects `Self` to be only used for a trait's `Self`.
                 // Instead, use gensym("Self") to create a distinct name that looks the same.
-                let ident = if param.ident.name == keywords::SelfType.name() {
+                let ident = if param.ident.name == keywords::SelfUpper.name() {
                     param.ident.gensym()
                 } else {
                     param.ident
@@ -2981,7 +2981,7 @@ impl<'a> LoweringContext<'a> {
 
                 // Correctly resolve `self` imports
                 if path.segments.len() > 1
-                    && path.segments.last().unwrap().ident.name == keywords::SelfValue.name()
+                    && path.segments.last().unwrap().ident.name == keywords::SelfLower.name()
                 {
                     let _ = path.segments.pop();
                     if rename.is_none() {

src/librustc/hir/map/mod.rs

@@ -475,7 +475,7 @@ impl<'hir> Map<'hir> {
 
     pub fn ty_param_name(&self, id: NodeId) -> Name {
         match self.get(id) {
-            Node::Item(&Item { node: ItemKind::Trait(..), .. }) => keywords::SelfType.name(),
+            Node::Item(&Item { node: ItemKind::Trait(..), .. }) => keywords::SelfUpper.name(),
             Node::GenericParam(param) => param.name.ident().name,
             _ => bug!("ty_param_name: {} not a type parameter", self.node_to_string(id)),
         }

src/librustc/hir/mod.rs

@@ -311,7 +311,7 @@ pub struct Path {
 
 impl Path {
     pub fn is_global(&self) -> bool {
-        !self.segments.is_empty() && self.segments[0].ident.name == keywords::CrateRoot.name()
+        !self.segments.is_empty() && self.segments[0].ident.name == keywords::PathRoot.name()
     }
 }
 

src/librustc/hir/print.rs

@@ -65,7 +65,7 @@ pub trait PpAnn {
 
 pub struct NoAnn;
 impl PpAnn for NoAnn {}
-pub const NO_ANN: &'static dyn PpAnn = &NoAnn;
+pub const NO_ANN: &dyn PpAnn = &NoAnn;
 
 impl PpAnn for hir::Crate {
     fn try_fetch_item(&self, item: ast::NodeId) -> Option<&hir::Item> {
@@ -1622,7 +1622,7 @@ impl<'a> State<'a> {
             if i > 0 {
                 self.s.word("::")?
             }
-            if segment.ident.name != keywords::CrateRoot.name() &&
+            if segment.ident.name != keywords::PathRoot.name() &&
                segment.ident.name != keywords::DollarCrate.name() {
                self.print_ident(segment.ident)?;
                segment.with_generic_args(|generic_args| {
@@ -1636,7 +1636,7 @@ impl<'a> State<'a> {
     }
 
     pub fn print_path_segment(&mut self, segment: &hir::PathSegment) -> io::Result<()> {
-        if segment.ident.name != keywords::CrateRoot.name() &&
+        if segment.ident.name != keywords::PathRoot.name() &&
            segment.ident.name != keywords::DollarCrate.name() {
            self.print_ident(segment.ident)?;
            segment.with_generic_args(|generic_args| {
@@ -1664,7 +1664,7 @@ impl<'a> State<'a> {
                     if i > 0 {
                         self.s.word("::")?
                     }
-                    if segment.ident.name != keywords::CrateRoot.name() &&
+                    if segment.ident.name != keywords::PathRoot.name() &&
                        segment.ident.name != keywords::DollarCrate.name() {
                         self.print_ident(segment.ident)?;
                         segment.with_generic_args(|generic_args| {

src/librustc/ich/impls_syntax.rs

@@ -134,14 +134,10 @@ impl_stable_hash_for!(struct ::syntax::attr::Stability {
     const_stability
 });
 
-impl<'a> HashStable<StableHashingContext<'a>>
-for ::syntax::edition::Edition {
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'a>,
-                                          hasher: &mut StableHasher<W>) {
-        mem::discriminant(self).hash_stable(hcx, hasher);
-    }
-}
+impl_stable_hash_for!(enum ::syntax::edition::Edition {
+    Edition2015,
+    Edition2018,
+});
 
 impl<'a> HashStable<StableHashingContext<'a>>
 for ::syntax::attr::StabilityLevel {

src/librustc/ich/mod.rs

@@ -24,15 +24,15 @@ mod impls_misc;
 mod impls_ty;
 mod impls_syntax;
 
-pub const ATTR_DIRTY: &'static str = "rustc_dirty";
-pub const ATTR_CLEAN: &'static str = "rustc_clean";
-pub const ATTR_IF_THIS_CHANGED: &'static str = "rustc_if_this_changed";
-pub const ATTR_THEN_THIS_WOULD_NEED: &'static str = "rustc_then_this_would_need";
-pub const ATTR_PARTITION_REUSED: &'static str = "rustc_partition_reused";
-pub const ATTR_PARTITION_CODEGENED: &'static str = "rustc_partition_codegened";
-pub const ATTR_EXPECTED_CGU_REUSE: &'static str = "rustc_expected_cgu_reuse";
+pub const ATTR_DIRTY: &str = "rustc_dirty";
+pub const ATTR_CLEAN: &str = "rustc_clean";
+pub const ATTR_IF_THIS_CHANGED: &str = "rustc_if_this_changed";
+pub const ATTR_THEN_THIS_WOULD_NEED: &str = "rustc_then_this_would_need";
+pub const ATTR_PARTITION_REUSED: &str = "rustc_partition_reused";
+pub const ATTR_PARTITION_CODEGENED: &str = "rustc_partition_codegened";
+pub const ATTR_EXPECTED_CGU_REUSE: &str = "rustc_expected_cgu_reuse";
 
-pub const IGNORED_ATTRIBUTES: &'static [&'static str] = &[
+pub const IGNORED_ATTRIBUTES: &[&str] = &[
     "cfg",
     ATTR_IF_THIS_CHANGED,
     ATTR_THEN_THIS_WOULD_NEED,

src/librustc/middle/liveness.rs

@@ -1575,7 +1575,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
                 let sp = ident.span;
                 let var = self.variable(hir_id, sp);
                 // Ignore unused self.
-                if ident.name != keywords::SelfValue.name() {
+                if ident.name != keywords::SelfLower.name() {
                     if !self.warn_about_unused(sp, hir_id, entry_ln, var) {
                         if self.live_on_entry(entry_ln, var).is_none() {
                             self.report_dead_assign(hir_id, sp, var, true);