std: Improve non-task-based usage #14644
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A few notable improvements were implemented to cut down on the number of aborts triggered by the standard library when a local task is not found. * Primarily, the unwinding functionality was restructured to support an unsafe top-level function, `try`. This function invokes a closure, capturing any failure which occurs inside of it. The purpose of this function is to be as lightweight of a "try block" as possible for rust, intended for use when the runtime is difficult to set up. This function is *not* meant to be used by normal rust code, nor should it be consider for use with normal rust code. * When invoking spawn(), a `fail!()` is triggered rather than an abort. * When invoking LocalIo::borrow(), which is transitively called by all I/O constructors, None is returned rather than aborting to indicate that there is no local I/O implementation. * Invoking get() on a TLD key will return None if no task is available * Invoking replace() on a TLD key will fail if no task is available. A test case was also added showing the variety of things that you can do without a runtime or task set up now. In general, this is just a refactoring to abort less quickly in the standard library when a local task is not found.
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…=brson A few notable improvements were implemented to cut down on the number of aborts triggered by the standard library when a local task is not found. * Primarily, the unwinding functionality was restructured to support an unsafe top-level function, `try`. This function invokes a closure, capturing any failure which occurs inside of it. The purpose of this function is to be as lightweight of a "try block" as possible for rust, intended for use when the runtime is difficult to set up. This function is *not* meant to be used by normal rust code, nor should it be consider for use with normal rust code. * When invoking spawn(), a `fail!()` is triggered rather than an abort. * When invoking LocalIo::borrow(), which is transitively called by all I/O constructors, None is returned rather than aborting to indicate that there is no local I/O implementation. A test case was also added showing the variety of things that you can do without a runtime or task set up now. In general, this is just a refactoring to abort less quickly in the standard library when a local task is not found.
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feat: don't wavy-underline the whole for loop
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rust-lang#14644) Closes rust-lang/rust-clippy#14578 changelog: [`unnecessary_lazy_evaluations`] fix wrong suggestions for async closure
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A few notable improvements were implemented to cut down on the number of aborts
triggered by the standard library when a local task is not found.
Primarily, the unwinding functionality was restructured to support an unsafe
top-level function,
try. This function invokes a closure, capturing anyfailure which occurs inside of it. The purpose of this function is to be as
lightweight of a "try block" as possible for rust, intended for use when the
runtime is difficult to set up.
This function is not meant to be used by normal rust code, nor should it be
consider for use with normal rust code.
When invoking spawn(), a
fail!()is triggered rather than an abort.When invoking LocalIo::borrow(), which is transitively called by all I/O
constructors, None is returned rather than aborting to indicate that there is
no local I/O implementation.
A test case was also added showing the variety of things that you can do without
a runtime or task set up now. In general, this is just a refactoring to abort
less quickly in the standard library when a local task is not found.