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add situation where var_os returns None

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Re-introduced some of the former errors as situations where `None` is returned.
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fleetingbytes 2023-04-03 16:46:43 +02:00 • committed by GitHub
parent 9f1a3a131b
commit c252f0d404
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1 changed files with 7 additions and 1 deletions
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8
library/std/src/env.rs
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@ -236,7 +236,13 @@ fn _var(key: &OsStr) -> Result<String, VarError> {
} }
/// Fetches the environment variable `key` from the current process, returning /// Fetches the environment variable `key` from the current process, returning
/// [`None`] if the variable isn't set or there's another error. /// [`None`] in the following situations:
///
/// - the environment variable isn't set
/// - the environment variable's name contains
/// the equal sign character (`=`) or the NUL character
///
/// If this is not desired, consider using [`var_os`].
/// ///
/// Note that the method will not check if the environment variable /// Note that the method will not check if the environment variable
/// is valid Unicode. If you want to have an error on invalid UTF-8, /// is valid Unicode. If you want to have an error on invalid UTF-8,