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bytes inside implicitly const-promoted expressions are immutable #1554

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Aug 22, 2024
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bytes inside implicitly const-promoted expressions are immutable #1554

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3 changes: 2 additions & 1 deletion src/behavior-considered-undefined.md
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Expand Up @@ -49,7 +49,7 @@ Please read the [Rustonomicon] before writing unsafe code.
All this also applies when values of these
types are passed in a (nested) field of a compound type, but not behind
pointer indirections.
* Mutating immutable bytes. All bytes inside a [`const`] item are immutable.
* Mutating immutable bytes. All bytes inside a [`const`] item or within an implicitly [const-promoted] expression are immutable.
The bytes owned by an immutable binding or immutable `static` are immutable, unless those bytes are part of an [`UnsafeCell<U>`].

Moreover, the bytes [pointed to] by a shared reference, including transitively through other references (both shared and mutable) and `Box`es, are immutable; transitivity includes those references stored in fields of compound types.
Expand Down Expand Up @@ -189,3 +189,4 @@ reading uninitialized memory is permitted are inside `union`s and in "padding"
[project-field]: expressions/field-expr.md
[project-tuple]: expressions/tuple-expr.md#tuple-indexing-expressions
[project-slice]: expressions/array-expr.md#array-and-slice-indexing-expressions
[const-promoted]: destructors.md#constant-promotion