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Rollup merge of #98617 - ChrisDenton:const-unwrap, r=Mark-Simulacrum

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Remove feature `const_option` from std

This is part of the effort to reduce the number of unstable features used by std. This one is easy as it's only used in one place.
This commit is contained in:
Matthias Krüger 2022-06-28 18:34:33 +02:00 committed by GitHub
parent 956a9f55c0 720c430822
commit a3bdd46431
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2 changed files with 15 additions and 5 deletions
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1
library/std/src/lib.rs
View file

@ -335,7 +335,6 @@
#![feature(const_ip)]
#![feature(const_ipv4)]
#![feature(const_ipv6)]
#![feature(const_option)]
#![feature(const_socketaddr)]
#![feature(thread_local_internals)]
//

19
library/std/src/sys/windows/args.rs
View file

@ -21,6 +21,17 @@
use core::iter;
/// This is the const equivalent to `NonZeroU16::new(n).unwrap()`
///
/// FIXME: This can be removed once `Option::unwrap` is stably const.
/// See the `const_option` feature (#67441).
const fn non_zero_u16(n: u16) -> NonZeroU16 {
match NonZeroU16::new(n) {
Some(n) => n,
None => panic!("called `unwrap` on a `None` value"),
}
}
pub fn args() -> Args {
// SAFETY: `GetCommandLineW` returns a pointer to a null terminated UTF-16
// string so it's safe for `WStrUnits` to use.
@ -58,10 +69,10 @@ fn parse_lp_cmd_line<'a, F: Fn() -> OsString>(
lp_cmd_line: Option<WStrUnits<'a>>,
exe_name: F,
) -> Vec<OsString> {
const BACKSLASH: NonZeroU16 = NonZeroU16::new(b'\\' as u16).unwrap();
const QUOTE: NonZeroU16 = NonZeroU16::new(b'"' as u16).unwrap();
const TAB: NonZeroU16 = NonZeroU16::new(b'\t' as u16).unwrap();
const SPACE: NonZeroU16 = NonZeroU16::new(b' ' as u16).unwrap();
const BACKSLASH: NonZeroU16 = non_zero_u16(b'\\' as u16);
const QUOTE: NonZeroU16 = non_zero_u16(b'"' as u16);
const TAB: NonZeroU16 = non_zero_u16(b'\t' as u16);
const SPACE: NonZeroU16 = non_zero_u16(b' ' as u16);
let mut ret_val = Vec::new();
// If the cmd line pointer is null or it points to an empty string then