Enum rustc_expand::mbe::metavar_expr::MetaVarExprConcatElem

pub(crate) enum MetaVarExprConcatElem {
    Ident(Ident),
    Literal(Symbol),
    Var(Ident),
}

Indicates what is placed in a concat parameter. For example, literals (${concat("foo", "bar")}) or adhoc identifiers (${concat(foo, bar)}).

Variants

Ident(Ident)

Identifier WITHOUT a preceding dollar sign, which means that this identifier should be interpreted as a literal.

Literal(Symbol)

For example, a number or a string.

Var(Ident)

Identifier WITH a preceding dollar sign, which means that this identifier should be expanded and interpreted as a variable.

Trait Implementations

impl Debug for MetaVarExprConcatElem

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

Formats the value using the given formatter.

impl<__D: SpanDecoder> Decodable<__D> for MetaVarExprConcatElem

fn decode(__decoder: &mut __D) -> Self

impl<__E: SpanEncoder> Encodable<__E> for MetaVarExprConcatElem

fn encode(&self, __encoder: &mut __E)

impl PartialEq for MetaVarExprConcatElem

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl StructuralPartialEq for MetaVarExprConcatElem

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

Size for each variant:

• Ident: 12 bytes
• Literal: 4 bytes
• Var: 12 bytes