hir_ty::mir::lower

Struct DropScopeToken

struct DropScopeToken;

Expand description

A token to ensuring that each drop scope is popped at most once, thanks to the compiler that checks moves.

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impl DropScopeToken

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fn pop_and_drop<'db>( self, ctx: &mut MirLowerCtx<'_, 'db>, current: BasicBlockId, span: MirSpan, ) -> BasicBlockId

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fn pop_assume_dropped(self, ctx: &mut MirLowerCtx<'_, '_>)

It is useful when we want a drop scope is syntactically closed, but we don’t want to execute any drop code. Either when the control flow is diverging (so drop code doesn’t reached) or when drop is handled for us (for example a block that ended with a return statement. Return will drop everything, so the block shouldn’t do anything)

Trait Implementations§

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impl Drop for DropScopeToken

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fn drop(&mut self)

Executes the destructor for this type. Read more

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fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned. Read more

Auto Trait Implementations§

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impl UnwindSafe for DropScopeToken

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoBox<dyn Any> for T
where T: Any,

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fn into_box(self) -> Box<dyn Any>

Convert self into the appropriate boxed form.

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impl<T> IntoBox<dyn Any + Send> for T
where T: Any + Send,

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fn into_box(self) -> Box<dyn Any + Send>

Convert self into the appropriate boxed form.

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impl<T> IntoBox<dyn Any + Send + Sync> for T
where T: Any + Send + Sync,

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fn into_box(self) -> Box<dyn Any + Send + Sync>

Convert self into the appropriate boxed form.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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