pub struct Sub<'combine, 'infcx, 'tcx> {
    fields: &'combine mut CombineFields<'infcx, 'tcx>,
    a_is_expected: bool,
}
Expand description

Ensures a is made a subtype of b. Returns a on success.

Fields

fields: &'combine mut CombineFields<'infcx, 'tcx>a_is_expected: bool

Implementations

Trait Implementations

Register an obligation that both constants must be equal to each other. Read more
Returns a static string we can use for printouts.
Returns true if the value a is the “expected” type in the relation. Just affects error messages. Read more
Switch variance for the purpose of relating a and b.
Generic relation routine suitable for most anything.
Relate the two substitutions for the given item. The default is to look up the variance for the item and proceed accordingly. Read more

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

Returns the argument unchanged.

Calls U::from(self).

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

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: 16 bytes