task: add track_caller to block_in_place and spawn_local
#5034
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Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds `#[track_caller]` to two public APIs in tokio task module which weren't added in #4848. * `tokio::task::block_in_place` * `tokio::task::spawn_local` These APIs had call stacks that went through closures, which is a use case not supported by `#[track_caller]`. These two cases have been refactored so that the `panic!` call is no longer inside a closure. Tests have been added for these two new cases. Refs: #4413
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Darksonn
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Sep 20, 2022
it doesn't work and shouldn't have been included in this PR.
Darksonn
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…s#5034) Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds `#[track_caller]` to two public APIs in tokio task module which weren't added in tokio-rs#4848. * `tokio::task::block_in_place` * `tokio::task::spawn_local` These APIs had call stacks that went through closures, which is a use case not supported by `#[track_caller]`. These two cases have been refactored so that the `panic!` call is no longer inside a closure. Tests have been added for these two new cases. Refs: tokio-rs#4413
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Motivation
Most of the public APIs in the
taskmodule were covered with the#[track_caller]attribute in #4848. However, two functions were skipped because the call stack
leading to the panic passed through a closure (rust-lang/rust#87417).
The fact that this is missing was brought up again in #5030. At that point, a work around
solution was collectively worked out for that use case, bringing the panic call outside the
closure.
Solution
Functions that may panic can be annotated with
#[track_caller]so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source.This change adds
#[track_caller]to two public APIs in tokio task module which weren't added in #4848.tokio::task::block_in_placetokio::task::spawn_localThese APIs had call stacks that went through closures, which is a use case not supported by
#[track_caller]. These two cases have been refactored so that thepanic!call is no longer inside a closure.Tests have been added for these two new cases.
Refs: #4413