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Document safety of Path casting #67635

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Dec 28, 2019
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Document safety of Path casting #67635

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7 changes: 7 additions & 0 deletions src/libstd/path.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -296,6 +296,13 @@ where
}

// See note at the top of this module to understand why these are used:
//
// These casts are safe as OsStr is internally a wrapper around [u8] on all
// platforms.
//
// Note that currently this relies on the special knowledge that libstd has;
// these types are single-element structs but are not marked repr(transparent)
// or repr(C) which would make these casts allowable outside std.
fn os_str_as_u8_slice(s: &OsStr) -> &[u8] {
unsafe { &*(s as *const OsStr as *const [u8]) }
}
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