Enum rustc_mir_build::thir::pattern::usefulness::Reachability

source · [−]
pub(crate) enum Reachability {
    Reachable(Vec<Span>),
    Unreachable,
}
Expand description

Indicates whether or not a given arm is reachable.

Variants

Reachable(Vec<Span>)

The arm is reachable. This additionally carries a set of or-pattern branches that have been found to be unreachable despite the overall arm being reachable. Used only in the presence of or-patterns, otherwise it stays empty.

Unreachable

The arm is unreachable.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. 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 resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
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:

  • Reachable: 24 bytes
  • Unreachable: 0 bytes