Struct rustc_borrowck::region_infer::AppliedMemberConstraint

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

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.

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§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§

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impl Debug for AppliedMemberConstraint

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

Formats the value using the given formatter. Read more

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Size: 12 bytes