Struct RegionConstraintData

pub struct RegionConstraintData<'db> {
    pub constraints: Vec<Constraint<'db>>,
    pub member_constraints: Vec<MemberConstraint<'db>>,
    pub verifys: Vec<Verify<'db>>,
}

The full set of region constraints gathered up by the collector. Describes constraints between the region variables and other regions, as well as other conditions that must be verified, or assumptions that can be made.

Fields

constraints: Vec<Constraint<'db>>

Constraints of the form A <= B, where either A or B can be a region variable (or neither, as it happens).

member_constraints: Vec<MemberConstraint<'db>>

Constraints of the form R0 member of [R1, ..., Rn], meaning that R0 must be equal to one of the regions R1..Rn. These occur with impl Trait quite frequently.

verifys: Vec<Verify<'db>>

A “verify” is something that we need to verify after inference is done, but which does not directly affect inference in any way.

An example is a A <= B where neither A nor B are inference variables.

Implementations

impl<'db> RegionConstraintData<'db>

pub fn is_empty(&self) -> bool

Returns true if this region constraint data contains no constraints, and false otherwise.

Trait Implementations

impl<'db> Clone for RegionConstraintData<'db>

fn clone(&self) -> RegionConstraintData<'db>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'db> Debug for RegionConstraintData<'db>

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

Formats the value using the given formatter.

impl<'db> Default for RegionConstraintData<'db>

fn default() -> RegionConstraintData<'db>

Returns the “default value” for a type.