Struct rustc_borrowck::region_infer::AppliedMemberConstraint

pub(crate) struct AppliedMemberConstraint {
    pub(crate) member_region_scc: ConstraintSccIndex,
    pub(crate) min_choice: RegionVid,
    pub(crate) member_constraint_index: NllMemberConstraintIndex,
}

Each time that apply_member_constraint is successful, it appends one of these structs to the member_constraints_applied field. This is used in error reporting to trace out what happened.

The way that apply_member_constraint works is that it effectively adds a new lower bound to the SCC it is analyzing: so you wind up with 'R: 'O where 'R is the pick-region and 'O is the minimal viable option.

Fields

member_region_scc: ConstraintSccIndex

The SCC that was affected. (The “member region”.)

The vector if AppliedMemberConstraint elements is kept sorted by this field.

min_choice: RegionVid

The “best option” that apply_member_constraint found – this was added as an “ad-hoc” lower-bound to member_region_scc.

member_constraint_index: NllMemberConstraintIndex

The “member constraint index” – we can find out details about the constraint from set.member_constraints[member_constraint_index].

Trait Implementations

impl Clone for AppliedMemberConstraint

fn clone(&self) -> AppliedMemberConstraint

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AppliedMemberConstraint

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

Formats the value using the given formatter.

impl Ord for AppliedMemberConstraint

fn cmp(&self, other: &AppliedMemberConstraint) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self where
    Self: PartialOrd<Self>, 

Restrict a value to a certain interval.

impl PartialEq<AppliedMemberConstraint> for AppliedMemberConstraint

fn eq(&self, other: &AppliedMemberConstraint) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &AppliedMemberConstraint) -> bool

This method tests for !=.

impl PartialOrd<AppliedMemberConstraint> for AppliedMemberConstraint

fn partial_cmp(&self, other: &AppliedMemberConstraint) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for AppliedMemberConstraint

impl Eq for AppliedMemberConstraint

impl StructuralEq for AppliedMemberConstraint

impl StructuralPartialEq for AppliedMemberConstraint

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: 12 bytes