# Struct rustc_mir_transform::coverage::spans::CoverageSpan

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    struct CoverageSpan {
        span: Span,
        bcb: BasicCoverageBlock,
        merged_spans: Vec<Span>,
        is_closure: bool,
    }

Expand description

A BCB is deconstructed into one or more `Span`s. Each `Span` maps to a `CoverageSpan` that references the originating BCB and one or more MIR `Statement`s and/or `Terminator`s. Initially, the `Span`s come from the `Statement`s and `Terminator`s, but subsequent transforms can combine adjacent `Span`s and `CoverageSpan` from the same BCB, merging the `merged_spans` vectors, and the `Span`s to cover the extent of the combined `Span`s.

Note: A span merged into another CoverageSpan may come from a `BasicBlock` that is not part of the `CoverageSpan` bcb if the statement was included because it’s `Span` matches or is subsumed by the `Span` associated with this `CoverageSpan`, and it’s `BasicBlock` `dominates()` the `BasicBlock`s in this `CoverageSpan`.

## Fields§

§`span: Span`§`bcb: BasicCoverageBlock`§`merged_spans: Vec<Span>`

List of all the original spans from MIR that have been merged into this span. Mainly used to precisely skip over gaps when truncating a span.

§`is_closure: bool`

## Implementations§

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### impl CoverageSpan

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#### fn new(span: Span, bcb: BasicCoverageBlock, is_closure: bool) -> Self

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#### pub fn merge_from(&mut self, other: &Self)

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#### pub fn cutoff_statements_at(&mut self, cutoff_pos: BytePos)

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#### pub fn is_mergeable(&self, other: &Self) -> bool

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#### pub fn is_in_same_bcb(&self, other: &Self) -> bool

## Trait Implementations§

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### impl Clone for CoverageSpan

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#### fn clone(&self) -> CoverageSpan

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for CoverageSpan

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl RefUnwindSafe for CoverageSpan

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### impl Send for CoverageSpan

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### impl Sync for CoverageSpan

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### impl Unpin for CoverageSpan

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### impl UnwindSafe for CoverageSpan

## 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> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> 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> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 40 bytes