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tweak MaybeUninit docs #82837

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Mar 7, 2021
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tweak MaybeUninit docs #82837

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9 changes: 5 additions & 4 deletions library/core/src/mem/maybe_uninit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -39,10 +39,11 @@ use crate::ptr;
/// let b: bool = unsafe { MaybeUninit::uninit().assume_init() }; // undefined behavior! ⚠️
/// ```
///
/// Moreover, uninitialized memory is special in that the compiler knows that
/// it does not have a fixed value. This makes it undefined behavior to have
/// uninitialized data in a variable even if that variable has an integer type,
/// which otherwise can hold any *fixed* bit pattern:
/// Moreover, uninitialized memory is special in that it does not have a fixed value ("fixed"
/// meaning "it won't change without being written to"). Reading the same uninitialized byte
/// multiple times can give different results. This makes it undefined behavior to have
/// uninitialized data in a variable even if that variable has an integer type, which otherwise can
/// hold any *fixed* bit pattern:
///
/// ```rust,no_run
/// # #![allow(invalid_value)]
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