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Add #[must_use] to char escape methods

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This commit is contained in:
John Kugelman 2021-10-09 21:35:09 -04:00
parent bb918d0a5b
commit fec9514727
1 changed files with 6 additions and 0 deletions
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6
library/core/src/char/methods.rs
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@ -377,6 +377,8 @@ pub fn to_digit(self, radix: u32) -> Option<u32> {
/// ```
/// assert_eq!('❤'.escape_unicode().to_string(), "\\u{2764}");
/// ```
#[must_use = "this returns the escaped char as an iterator, \
without modifying the original"]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn escape_unicode(self) -> EscapeUnicode {
@ -453,6 +455,8 @@ pub(crate) fn escape_debug_ext(self, args: EscapeDebugExtArgs) -> EscapeDebug {
/// ```
/// assert_eq!('\n'.escape_debug().to_string(), "\\n");
/// ```
#[must_use = "this returns the escaped char as an iterator, \
without modifying the original"]
#[stable(feature = "char_escape_debug", since = "1.20.0")]
#[inline]
pub fn escape_debug(self) -> EscapeDebug {
@ -507,6 +511,8 @@ pub fn escape_debug(self) -> EscapeDebug {
/// ```
/// assert_eq!('"'.escape_default().to_string(), "\\\"");
/// ```
#[must_use = "this returns the escaped char as an iterator, \
without modifying the original"]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn escape_default(self) -> EscapeDefault {