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Tracking issue for Result::map_or #66293

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@tesuji

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@tesuji

PR #66292 added Result::map_or with implementation:

impl<T, E> Result<T, E> {
    pub fn map_or<U, F: FnOnce(T) -> U>(self, default: U, f: F) -> U {
        match self {
            Ok(t) => f(t),
            Err(_) => default,
        }
    }
}

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    C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCT-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.

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