Auto merge of #71410 - JohnTitor:rollup-vh6dut5, r=JohnTitor

Rollup of 7 pull requests

Successful merges:

 - #70998 (Suggest `-> impl Trait` and `-> Box<dyn Trait>` on fn that doesn't return)
 - #71236 (Remove unused rustc_serialize::hex module)
 - #71366 (Use assoc int consts3)
 - #71372 (Fix #! (shebang) stripping account space issue)
 - #71384 (Fix stage0.txt version number comment)
 - #71390 (Fix incorrect description of E0690)
 - #71399 (Clean up E0554 explanation)

Failed merges:

r? @ghost

Author: bors

Cargo.lock

@@ -3577,7 +3577,6 @@ version = "0.0.0"
 dependencies = [
  "log",
  "rustc_ast",
- "rustc_data_structures",
  "rustc_span",
 ]
 
@@ -3594,7 +3593,6 @@ dependencies = [
  "rustc_session",
  "rustc_span",
  "serialize",
- "smallvec 1.0.0",
 ]
 
 [[package]]
@@ -3666,7 +3664,6 @@ dependencies = [
  "rustc_hir",
  "rustc_incremental",
  "rustc_index",
- "rustc_metadata",
  "rustc_middle",
  "rustc_session",
  "rustc_span",
@@ -3809,7 +3806,6 @@ version = "0.0.0"
 dependencies = [
  "rustc_ast",
  "rustc_ast_pretty",
- "rustc_data_structures",
  "rustc_hir",
  "rustc_span",
  "rustc_target",
@@ -3879,7 +3875,6 @@ dependencies = [
  "rustc_expand",
  "rustc_hir",
  "rustc_incremental",
- "rustc_infer",
  "rustc_lint",
  "rustc_metadata",
  "rustc_middle",
@@ -3924,7 +3919,6 @@ dependencies = [
  "rustc_feature",
  "rustc_hir",
  "rustc_index",
- "rustc_infer",
  "rustc_middle",
  "rustc_session",
  "rustc_span",
@@ -3986,10 +3980,8 @@ dependencies = [
  "backtrace",
  "bitflags",
  "byteorder",
- "jobserver",
  "log",
  "measureme",
- "parking_lot 0.10.2",
  "polonius-engine",
  "rustc-rayon",
  "rustc-rayon-core",
@@ -4023,7 +4015,6 @@ dependencies = [
  "polonius-engine",
  "rustc_apfloat",
  "rustc_ast",
- "rustc_ast_pretty",
  "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
@@ -4079,7 +4070,6 @@ dependencies = [
  "rustc_lexer",
  "rustc_session",
  "rustc_span",
- "smallvec 1.0.0",
  "unicode-normalization",
 ]
 
@@ -4092,10 +4082,8 @@ dependencies = [
  "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
- "rustc_feature",
  "rustc_hir",
  "rustc_index",
- "rustc_infer",
  "rustc_middle",
  "rustc_session",
  "rustc_span",
@@ -4143,7 +4131,6 @@ dependencies = [
  "rustc_data_structures",
  "rustc_errors",
  "rustc_index",
- "rustc_macros",
  "rustc_span",
  "serialize",
  "smallvec 1.0.0",
@@ -4296,10 +4283,8 @@ dependencies = [
  "rustc_data_structures",
  "rustc_hir",
  "rustc_infer",
- "rustc_macros",
  "rustc_middle",
  "rustc_span",
- "rustc_target",
  "rustc_trait_selection",
  "smallvec 1.0.0",
 ]

src/libcore/iter/adapters/mod.rs

@@ -2,7 +2,6 @@ use crate::cmp;
 use crate::fmt;
 use crate::intrinsics;
 use crate::ops::{Add, AddAssign, Try};
-use crate::usize;
 
 use super::{from_fn, LoopState};
 use super::{DoubleEndedIterator, ExactSizeIterator, FusedIterator, Iterator, TrustedLen};

src/libcore/iter/range.rs

@@ -1,7 +1,6 @@
 use crate::convert::TryFrom;
 use crate::mem;
 use crate::ops::{self, Add, Sub, Try};
-use crate::usize;
 
 use super::{FusedIterator, TrustedLen};
 

src/libcore/iter/sources.rs

@@ -1,6 +1,5 @@
 use crate::fmt;
 use crate::marker;
-use crate::usize;
 
 use super::{FusedIterator, TrustedLen};
 

src/libcore/num/f32.rs

@@ -265,7 +265,7 @@ impl f32 {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn is_infinite(self) -> bool {
-        self.abs_private() == INFINITY
+        self.abs_private() == Self::INFINITY
     }
 
     /// Returns `true` if this number is neither infinite nor `NaN`.
@@ -287,7 +287,7 @@ impl f32 {
     pub fn is_finite(self) -> bool {
         // There's no need to handle NaN separately: if self is NaN,
         // the comparison is not true, exactly as desired.
-        self.abs_private() < INFINITY
+        self.abs_private() < Self::INFINITY
     }
 
     /// Returns `true` if the number is neither zero, infinite,

src/libcore/num/f64.rs

@@ -264,7 +264,7 @@ impl f64 {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn is_infinite(self) -> bool {
-        self.abs_private() == INFINITY
+        self.abs_private() == Self::INFINITY
     }
 
     /// Returns `true` if this number is neither infinite nor `NaN`.
@@ -286,7 +286,7 @@ impl f64 {
     pub fn is_finite(self) -> bool {
         // There's no need to handle NaN separately: if self is NaN,
         // the comparison is not true, exactly as desired.
-        self.abs_private() < INFINITY
+        self.abs_private() < Self::INFINITY
     }
 
     /// Returns `true` if the number is neither zero, infinite,

src/libcore/num/flt2dec/decoder.rs

@@ -2,7 +2,6 @@
 
 use crate::num::dec2flt::rawfp::RawFloat;
 use crate::num::FpCategory;
-use crate::{f32, f64};
 
 /// Decoded unsigned finite value, such that:
 ///

src/libcore/num/flt2dec/mod.rs

@@ -123,7 +123,6 @@ functions.
 )]
 
 pub use self::decoder::{decode, DecodableFloat, Decoded, FullDecoded};
-use crate::i16;
 
 pub mod decoder;
 pub mod estimator;

src/libcore/num/int_macros.rs

@@ -14,14 +14,14 @@ macro_rules! int_module {
             concat!("The smallest value that can be represented by this integer type.
 Use [`", stringify!($T), "::MIN", "`](../../std/primitive.", stringify!($T), ".html#associatedconstant.MIN) instead."),
             #[$attr]
-            pub const MIN: $T = $T::min_value();
+            pub const MIN: $T = $T::MIN;
         }
 
         doc_comment! {
             concat!("The largest value that can be represented by this integer type.
 Use [`", stringify!($T), "::MAX", "`](../../std/primitive.", stringify!($T), ".html#associatedconstant.MAX) instead."),
             #[$attr]
-            pub const MAX: $T = $T::max_value();
+            pub const MAX: $T = $T::MAX;
         }
     )
 }

src/libcore/slice/memchr.rs

@@ -34,7 +34,7 @@ fn repeat_byte(b: u8) -> usize {
 #[cfg(not(target_pointer_width = "16"))]
 #[inline]
 fn repeat_byte(b: u8) -> usize {
-    (b as usize) * (crate::usize::MAX / 255)
+    (b as usize) * (usize::MAX / 255)
 }
 
 /// Returns the first index matching the byte `x` in `text`.

src/libcore/slice/mod.rs

@@ -28,7 +28,6 @@ use crate::cmp;
 use crate::cmp::Ordering::{self, Equal, Greater, Less};
 use crate::fmt;
 use crate::intrinsics::{assume, exact_div, is_aligned_and_not_null, unchecked_sub};
-use crate::isize;
 use crate::iter::*;
 use crate::marker::{self, Copy, Send, Sized, Sync};
 use crate::mem;

src/libcore/str/pattern.rs

@@ -46,7 +46,6 @@
 use crate::cmp;
 use crate::fmt;
 use crate::slice::memchr;
-use crate::usize;
 
 // Pattern
 

src/libcore/time.rs

@@ -12,9 +12,9 @@
 //! assert_eq!(Duration::new(5, 0), Duration::from_secs(5));
 //! ```
 
+use crate::fmt;
 use crate::iter::Sum;
 use crate::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};
-use crate::{fmt, u64};
 
 const NANOS_PER_SEC: u32 = 1_000_000_000;
 const NANOS_PER_MILLI: u32 = 1_000_000;

src/librustc_ast_pretty/Cargo.toml

@@ -12,5 +12,4 @@ doctest = false
 [dependencies]
 log = "0.4"
 rustc_span = { path = "../librustc_span" }
-rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_ast = { path = "../librustc_ast" }

src/librustc_attr/Cargo.toml

@@ -17,6 +17,5 @@ rustc_span = { path = "../librustc_span" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_feature = { path = "../librustc_feature" }
 rustc_macros = { path = "../librustc_macros" }
-smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 rustc_session = { path = "../librustc_session" }
 rustc_ast = { path = "../librustc_ast" }

src/librustc_codegen_ssa/Cargo.toml

@@ -34,4 +34,3 @@ rustc_incremental = { path = "../librustc_incremental" }
 rustc_index = { path = "../librustc_index" }
 rustc_target = { path = "../librustc_target" }
 rustc_session = { path = "../librustc_session" }
-rustc_metadata = { path = "../librustc_metadata" }

src/librustc_data_structures/lib.rs

@@ -29,8 +29,6 @@ extern crate log;
 #[macro_use]
 extern crate cfg_if;
 
-pub use rustc_serialize::hex::ToHex;
-
 #[inline(never)]
 #[cold]
 pub fn cold_path<F: FnOnce() -> R, R>(f: F) -> R {

src/librustc_error_codes/error_codes/E0554.md

@@ -1,7 +1,7 @@
 Feature attributes are only allowed on the nightly release channel. Stable or
 beta compilers will not comply.
 
-Example of erroneous code (on a stable compiler):
+Erroneous code example:
 
 ```ignore (depends on release channel)
 #![feature(non_ascii_idents)] // error: `#![feature]` may not be used on the

src/librustc_error_codes/error_codes/E0690.md

@@ -14,7 +14,7 @@ struct LengthWithUnit<U> { // error: transparent struct needs exactly one
 Because transparent structs are represented exactly like one of their fields at
 run time, said field must be uniquely determined. If there is no field, or if
 there are multiple fields, it is not clear how the struct should be represented.
-Note that fields of zero-typed types (e.g., `PhantomData`) can also exist
+Note that fields of zero-sized types (e.g., `PhantomData`) can also exist
 alongside the field that contains the actual data, they do not count for this
 error. When generic types are involved (as in the above example), an error is
 reported because the type parameter could be non-zero-sized.

src/librustc_error_codes/error_codes/E0746.md

@@ -2,8 +2,7 @@ Return types cannot be `dyn Trait`s as they must be `Sized`.
 
 Erroneous code example:
 
-```compile_fail,E0277
-# // FIXME: after E0746 is in beta, change the above
+```compile_fail,E0746
 trait T {
     fn bar(&self);
 }

src/librustc_hir_pretty/Cargo.toml

@@ -13,6 +13,5 @@ doctest = false
 rustc_ast_pretty = { path = "../librustc_ast_pretty" }
 rustc_hir = { path = "../librustc_hir" }
 rustc_target = { path = "../librustc_target" }
-rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_span = { path = "../librustc_span" }
 rustc_ast = { path = "../librustc_ast" }

src/librustc_interface/Cargo.toml

@@ -32,7 +32,6 @@ rustc_codegen_ssa = { path = "../librustc_codegen_ssa" }
 rustc_symbol_mangling = { path = "../librustc_symbol_mangling" }
 rustc_codegen_llvm = { path = "../librustc_codegen_llvm", optional = true }
 rustc_hir = { path = "../librustc_hir" }
-rustc_infer = { path = "../librustc_infer" }
 rustc_metadata = { path = "../librustc_metadata" }
 rustc_mir = { path = "../librustc_mir" }
 rustc_mir_build = { path = "../librustc_mir_build" }

src/librustc_lexer/src/lib.rs

@@ -236,12 +236,17 @@ pub enum Base {
 /// (e.g. "#![deny(missing_docs)]").
 pub fn strip_shebang(input: &str) -> Option<usize> {
     debug_assert!(!input.is_empty());
-    if !input.starts_with("#!") || input.starts_with("#![") {
+    let s: &str = &remove_whitespace(input);
+    if !s.starts_with("#!") || s.starts_with("#![") {
         return None;
     }
     Some(input.find('\n').unwrap_or(input.len()))
 }
 
+fn remove_whitespace(s: &str) -> String {
+    s.chars().filter(|c| !c.is_whitespace()).collect()
+}
+
 /// Parses the first token from the provided input string.
 pub fn first_token(input: &str) -> Token {
     debug_assert!(!input.is_empty());

src/librustc_lexer/src/tests.rs

@@ -145,4 +145,22 @@ mod tests {
             }),
         );
     }
+
+    #[test]
+    fn test_valid_shebang() {
+        // https://github.com/rust-lang/rust/issues/70528
+        let input = "#!/usr/bin/rustrun";
+        let actual = strip_shebang(input);
+        let expected: Option<usize> = Some(18);
+        assert_eq!(expected, actual);
+    }
+
+    #[test]
+    fn test_invalid_shebang_valid_rust_syntax() {
+        // https://github.com/rust-lang/rust/issues/70528
+        let input = "#!    [bad_attribute]";
+        let actual = strip_shebang(input);
+        let expected: Option<usize> = None;
+        assert_eq!(expected, actual);
+    }
 }

src/librustc_lint/Cargo.toml

@@ -23,5 +23,4 @@ rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_feature = { path = "../librustc_feature" }
 rustc_index = { path = "../librustc_index" }
 rustc_session = { path = "../librustc_session" }
-rustc_infer = { path = "../librustc_infer" }
 rustc_trait_selection = { path = "../librustc_trait_selection" }

src/librustc_middle/Cargo.toml

@@ -12,7 +12,6 @@ doctest = false
 [dependencies]
 arena = { path = "../libarena" }
 bitflags = "1.2.1"
-jobserver = "0.1"
 scoped-tls = "1.0"
 log = { version = "0.4", features = ["release_max_level_info", "std"] }
 rustc-rayon = "0.3.0"
@@ -32,7 +31,6 @@ rustc_serialize = { path = "../libserialize", package = "serialize" }
 rustc_ast = { path = "../librustc_ast" }
 rustc_span = { path = "../librustc_span" }
 backtrace = "0.3.40"
-parking_lot = "0.10"
 byteorder = { version = "1.3" }
 smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 measureme = "0.7.1"

src/librustc_mir/Cargo.toml

@@ -17,7 +17,6 @@ log = "0.4"
 log_settings = "0.1.1"
 polonius-engine = "0.12.0"
 rustc_middle = { path = "../librustc_middle" }
-rustc_ast_pretty = { path = "../librustc_ast_pretty" }
 rustc_attr = { path = "../librustc_attr" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_errors = { path = "../librustc_errors" }

src/librustc_parse/Cargo.toml

@@ -17,7 +17,6 @@ rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_feature = { path = "../librustc_feature" }
 rustc_lexer = { path = "../librustc_lexer" }
 rustc_errors = { path = "../librustc_errors" }
-smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 rustc_session = { path = "../librustc_session" }
 rustc_span = { path = "../librustc_span" }
 rustc_ast = { path = "../librustc_ast" }

src/librustc_passes/Cargo.toml

@@ -14,10 +14,8 @@ rustc_middle = { path = "../librustc_middle" }
 rustc_attr = { path = "../librustc_attr" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_errors = { path = "../librustc_errors" }
-rustc_feature = { path = "../librustc_feature" }
 rustc_hir = { path = "../librustc_hir" }
 rustc_index = { path = "../librustc_index" }
-rustc_infer = { path = "../librustc_infer" }
 rustc_session = { path = "../librustc_session" }
 rustc_target = { path = "../librustc_target" }
 rustc_ast = { path = "../librustc_ast" }