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Apply noundef attribute to all scalar types which do not permit raw init by erik...
source link: https://github.com/rust-lang/rust/pull/94157
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Beyond &/&mut/Box, this covers char, enum discriminants, NonZero*, etc.
All such types currently cause a Miri error if left uninitialized,
and an invalid_value lint in cases like mem::uninitialized::<char>().
Note that this does not change whether or not it is UB for u64 (or
other integer types with no invalid values) to be undef.
Fixes (partially) #74378.
@rustbot label S-blocked
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