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set_env: State the conclusion upfront #126281

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Jun 12, 2024
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set_env: State the conclusion upfront #126281

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12 changes: 8 additions & 4 deletions library/std/src/env.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -323,8 +323,10 @@ impl Error for VarError {
/// This function is also always safe to call on Windows, in single-threaded
/// and multi-threaded programs.
///
/// In multi-threaded programs on other operating systems, we strongly suggest
/// not using `set_var` or `remove_var` at all. The exact requirement is: you
/// In multi-threaded programs on other operating systems, the only safe option is
/// to not use `set_var` or `remove_var` at all.
///
/// The exact requirement is: you
/// must ensure that there are no other threads concurrently writing or
/// *reading*(!) the environment through functions or global variables other
/// than the ones in this module. The problem is that these operating systems
Expand Down Expand Up @@ -390,8 +392,10 @@ unsafe fn _set_var(key: &OsStr, value: &OsStr) {
/// This function is also always safe to call on Windows, in single-threaded
/// and multi-threaded programs.
///
/// In multi-threaded programs on other operating systems, we strongly suggest
/// not using `set_var` or `remove_var` at all. The exact requirement is: you
/// In multi-threaded programs on other operating systems, the only safe option is
/// to not use `set_var` or `remove_var` at all.
///
/// The exact requirement is: you
/// must ensure that there are no other threads concurrently writing or
/// *reading*(!) the environment through functions or global variables other
/// than the ones in this module. The problem is that these operating systems
Expand Down
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