Enum rustc_trait_selection::infer::region_constraints::Constraint[−][src]

pub enum Constraint<'tcx> {
    VarSubVar(RegionVid, RegionVid),
    RegSubVar(&RegionKind, RegionVid),
    VarSubReg(RegionVid, &RegionKind),
    RegSubReg(&RegionKind, &RegionKind),
}
Expand description

Represents a constraint that influences the inference process.

Variants

VarSubVar(RegionVid, RegionVid)

Tuple Fields

0: RegionVid
1: RegionVid

A region variable is a subregion of another.

RegSubVar(&RegionKind, RegionVid)

Tuple Fields

0: &RegionKind
1: RegionVid

A concrete region is a subregion of region variable.

VarSubReg(RegionVid, &RegionKind)

Tuple Fields

0: RegionVid
1: &RegionKind

A region variable is a subregion of a concrete region. This does not directly affect inference, but instead is checked after inference is complete.

RegSubReg(&RegionKind, &RegionKind)

Tuple Fields

0: &RegionKind
1: &RegionKind

A constraint where neither side is a variable. This does not directly affect inference, but instead is checked after inference is complete.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion 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

Size for each variant:

  • VarSubVar: 8 bytes
  • RegSubVar: 12 bytes
  • VarSubReg: 12 bytes
  • RegSubReg: 20 bytes