Enum GuardQualifier 

#[non_exhaustive]
pub enum GuardQualifier {
    Bool {
        expr: Expr,
        pos: Pos,
        span: Span,
    },
    Pattern {
        pat: Pat,
        expr: Expr,
        pos: Pos,
        span: Span,
    },
}

Boolean or pattern guard qualifier in a guarded case alternative branch.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Bool

Boolean guard expression.

Fields

expr: Expr

Guard expression.

pos: Pos

Position of the guard’s first token.

span: Span

Span of the guard qualifier.

Pattern

Pattern guard pat <- expr.

Fields

pat: Pat

Pattern bound by the guard.

expr: Expr

Source expression on the right of <-.

pos: Pos

Position of the pattern guard’s first token.

span: Span

Span of the pattern guard qualifier.

Implementations

impl GuardQualifier

pub const fn span(&self) -> Span

pub const fn pos(&self) -> Pos

Trait Implementations

impl Clone for GuardQualifier

fn clone(&self) -> GuardQualifier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GuardQualifier

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

Formats the value using the given formatter.

impl Eq for GuardQualifier

impl PartialEq for GuardQualifier

fn eq(&self, other: &GuardQualifier) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for GuardQualifier