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Rollup merge of #85425 - mbartlett21:patch-1, r=scottmcm

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Fix must_use on `Option::is_none`

This fixes the `#[must_use = ...]` on `Option::is_none` to have a working suggestion.
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Jack Huey 2021-05-18 22:36:18 -04:00 • committed by GitHub
commit e113a4f77b
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library/core/src/option.rs
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@ -209,7 +209,7 @@ impl<T> Option<T> {
/// assert_eq!(x.is_none(), true);
/// ```
#[must_use = "if you intended to assert that this doesn't have a value, consider \
`.and_then(|| panic!(\"`Option` had a value when expected `None`\"))` instead"]
`.and_then(|_| panic!(\"`Option` had a value when expected `None`\"))` instead"]
#[inline]
#[rustc_const_stable(feature = "const_option", since = "1.48.0")]
#[stable(feature = "rust1", since = "1.0.0")]