pub struct OutlivesSuggestionBuilder {
    constraints_to_add: BTreeMap<RegionVid, Vec<RegionVid>>,
}
Expand description

Collects information about outlives constraints that needed to be added for a given MIR node corresponding to a function definition.

Adds a help note suggesting adding a where clause with the needed constraints.

Fields§

§constraints_to_add: BTreeMap<RegionVid, Vec<RegionVid>>

The list of outlives constraints that need to be added. Specifically, we map each free region to all other regions that it must outlive. I will use the shorthand fr: outlived_frs. Not all of these regions will already have names necessarily. Some could be implicit free regions that we inferred. These will need to be given names in the final suggestion message.

Implementations§

source§

impl OutlivesSuggestionBuilder

source

fn region_name_is_suggestable(name: &RegionName) -> bool

Returns true iff the RegionNameSource is a valid source for an outlives suggestion.

source

fn region_vid_to_name( &self, mbcx: &MirBorrowckCtxt<'_, '_>, region: RegionVid ) -> Option<RegionName>

Returns a name for the region if it is suggestable. See region_name_is_suggestable.

source

fn compile_all_suggestions( &self, mbcx: &MirBorrowckCtxt<'_, '_> ) -> SmallVec<[SuggestedConstraint; 2]>

Compiles a list of all suggestions to be printed in the final big suggestion.

source

pub(crate) fn collect_constraint( &mut self, fr: RegionVid, outlived_fr: RegionVid )

Add the outlives constraint fr: outlived_fr to the set of constraints we need to suggest.

source

pub(crate) fn intermediate_suggestion( &mut self, mbcx: &MirBorrowckCtxt<'_, '_>, errci: &ErrorConstraintInfo<'_>, diag: &mut Diagnostic )

Emit an intermediate note on the given Diagnostic if the involved regions are suggestable.

source

pub(crate) fn add_suggestion(&self, mbcx: &mut MirBorrowckCtxt<'_, '_>)

If there is a suggestion to emit, add a diagnostic to the buffer. This is the final suggestion including all collected constraints.

Trait Implementations§

source§

impl Default for OutlivesSuggestionBuilder

source§

fn default() -> OutlivesSuggestionBuilder

Returns the “default value” for a type. Read more

Auto Trait Implementations§

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

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

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

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

const: unstable · source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

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

source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
const: unstable · source§

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: 24 bytes