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Rollup merge of #44396 - joshlf:tls-comment, r=alexcrichton

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std:🧵:LocalKey: Document limitation with initializers

Document that if a `LocalKey`'s initializer recursively depends on itself, initialization will result in infinite recursion.
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Guillaume Gomez 2017-09-10 14:03:27 +02:00 • committed by GitHub
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4
src/libstd/thread/local.rs
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@ -31,6 +31,10 @@ use mem;
/// within a thread, and values that implement [`Drop`] get destructed when a /// within a thread, and values that implement [`Drop`] get destructed when a
/// thread exits. Some caveats apply, which are explained below. /// thread exits. Some caveats apply, which are explained below.
/// ///
/// A `LocalKey`'s initializer cannot recursively depend on itself, and using
/// a `LocalKey` in this way will cause the initializer to infinitely recurse
/// on the first call to `with`.
///
/// # Examples /// # Examples
/// ///
/// ``` /// ```