rust/src/doc/tarpl/uninitialized.md

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% Working With Uninitialized Memory
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All runtime-allocated memory in a Rust program begins its life as
*uninitialized*. In this state the value of the memory is an indeterminate pile
of bits that may or may not even reflect a valid state for the type that is
supposed to inhabit that location of memory. Attempting to interpret this memory
as a value of *any* type will cause Undefined Behaviour. Do Not Do This.
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Rust provides mechanisms to work with uninitialized memory in checked (safe) and
unchecked (unsafe) ways.