Because the last item needs special handling, it seems that LLVM has trouble canonicalizing the loops in external iteration.  With the override, it becomes obvious that the start==end case exits the loop (as opposed to the one *after* that exiting the loop in external iteration).

Most of them were found by codespell: https://github.com/lucasdemarchi/codespell

…eavus

Document std::os::raw.

This adds a brief explanation to each type and its definition according to C. This also helps clarify that the definitions of the types, as described by rustdoc, are not necessarily the same from platform to platform.

…lacrum

libtest: Replace panics with error messages

This replaces explicit panics on failures in libtest with prints to stderr.
Where "failures" == CLI argument parsing and such

Before:
```
$ ./foo-stable --not-an-option
thread 'main' panicked at '"Unrecognized option: \'not-an-option\'"', libtest/lib.rs:251:27
note: Run with `RUST_BACKTRACE=1` for a backtrace.
```

After:
```
$ ./foo-nightly --not-an-option
error: Unrecognized option: 'not-an-option'
```

…, r=alexcrichton

Override try_[r]fold for RangeInclusive

Because the last item needs special handling, it seems that LLVM has trouble canonicalizing the loops in external iteration.  With the override, it becomes obvious that the start==end case exits the loop (as opposed to the one *after* that exiting the loop in external iteration).

Demo adapted from rust-lang#45222
```rust
#[no_mangle]
pub fn foo3r(n: u64) -> u64 {
    let mut count = 0;
    (0..n).for_each(|_| {
        (0 ..= n).rev().for_each(|j| {
            count += j;
        })
    });
    count
}
```

<details>
 <summary>Current nightly ASM, 100 lines (https://play.rust-lang.org/?gist=f5674c702c6e2045c3aab5d03763e5f6&version=nightly&mode=release)</summary>

```asm
foo3r:
	pushq	%rbx
.Lcfi0:
.Lcfi1:
	testq	%rdi, %rdi
	je	.LBB0_1
	testb	$1, %dil
	jne	.LBB0_4
	xorl	%eax, %eax
	xorl	%r8d, %r8d
	cmpq	$1, %rdi
	jne	.LBB0_11
	jmp	.LBB0_23
.LBB0_1:
	xorl	%eax, %eax
	popq	%rbx
	retq
.LBB0_4:
	xorl	%r8d, %r8d
	movq	$-1, %r9
	xorl	%eax, %eax
	movq	%rdi, %r11
	xorl	%r10d, %r10d
	jmp	.LBB0_5
.LBB0_8:
	addq	%r11, %rax
	movq	%rsi, %r11
	movq	%rdx, %r10
.LBB0_5:
	cmpq	%r11, %r10
	movl	$1, %ecx
	cmovbq	%r9, %rcx
	cmoveq	%r8, %rcx
	testq	%rcx, %rcx
	movl	$0, %esi
	movl	$1, %edx
	je	.LBB0_8
	cmpq	$-1, %rcx
	jne	.LBB0_9
	leaq	-1(%r11), %rsi
	movq	%r10, %rdx
	jmp	.LBB0_8
.LBB0_9:
	movl	$1, %r8d
	cmpq	$1, %rdi
	je	.LBB0_23
.LBB0_11:
	xorl	%r9d, %r9d
	movq	$-1, %r10
.LBB0_12:
	movq	%rdi, %rsi
	xorl	%r11d, %r11d
	jmp	.LBB0_13
.LBB0_16:
	addq	%rsi, %rax
	movq	%rcx, %rsi
	movq	%rbx, %r11
.LBB0_13:
	cmpq	%rsi, %r11
	movl	$1, %edx
	cmovbq	%r10, %rdx
	cmoveq	%r9, %rdx
	testq	%rdx, %rdx
	movl	$0, %ecx
	movl	$1, %ebx
	je	.LBB0_16
	cmpq	$-1, %rdx
	jne	.LBB0_17
	leaq	-1(%rsi), %rcx
	movq	%r11, %rbx
	jmp	.LBB0_16
.LBB0_17:
	movq	%rdi, %rcx
	xorl	%r11d, %r11d
	jmp	.LBB0_18
.LBB0_21:
	addq	%rcx, %rax
	movq	%rsi, %rcx
	movq	%rbx, %r11
.LBB0_18:
	cmpq	%rcx, %r11
	movl	$1, %edx
	cmovbq	%r10, %rdx
	cmoveq	%r9, %rdx
	testq	%rdx, %rdx
	movl	$0, %esi
	movl	$1, %ebx
	je	.LBB0_21
	cmpq	$-1, %rdx
	jne	.LBB0_22
	leaq	-1(%rcx), %rsi
	movq	%r11, %rbx
	jmp	.LBB0_21
.LBB0_22:
	addq	$2, %r8
	cmpq	%rdi, %r8
	jne	.LBB0_12
.LBB0_23:
	popq	%rbx
	retq
.Lfunc_end0:
```
</details><br>

With this PR:
```asm
foo3r:
	test	rcx, rcx
	je	.LBB3_1
	lea	r8, [rcx - 1]
	lea	rdx, [rcx - 2]
	mov	rax, r8
	mul	rdx
	shld	rdx, rax, 63
	imul	r8, r8
	add	r8, rcx
	sub	r8, rdx
	imul	r8, rcx
	mov	rax, r8
	ret
.LBB3_1:
	xor	r8d, r8d
	mov	rax, r8
	ret
```

…alexcrichton

Use time crate in bootstrap dist instead of date

`bootstrap dist` command is trying to run *NIX specific `date` command to get current month and year. This command keep failing when it's called on a Windows command prompt. This patch is making it use time crate.

Closes: rust-lang#47908

… r=nikomatsakis

Document that associated constants prevent a trait from being made into an object

Fixes rust-lang#47952

Add a short mention of associated constants to E0038

…s, r=kennytm

config.toml.example: fix typos.

Most of them were found by codespell: https://github.com/lucasdemarchi/codespell

proc_macro: don't panic parsing ..= (fix rust-lang#47950)