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Update unwinding.md

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`catch_unwind` is not unstable anymore
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CreepySkeleton 6 years ago committed by Alexis Beingessner
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@ -31,7 +31,7 @@ panics can only be caught by the parent thread. This means catching a panic
requires spinning up an entire OS thread! This unfortunately stands in conflict requires spinning up an entire OS thread! This unfortunately stands in conflict
to Rust's philosophy of zero-cost abstractions. to Rust's philosophy of zero-cost abstractions.
There is an unstable API called `catch_panic` that enables catching a panic There is an API called `catch_panic` that enables catching a panic
without spawning a thread. Still, we would encourage you to only do this without spawning a thread. Still, we would encourage you to only do this
sparingly. In particular, Rust's current unwinding implementation is heavily sparingly. In particular, Rust's current unwinding implementation is heavily
optimized for the "doesn't unwind" case. If a program doesn't unwind, there optimized for the "doesn't unwind" case. If a program doesn't unwind, there

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