Enum PrefixEntryPoint

pub enum PrefixEntryPoint {
    Vis,
    Block,
    Stmt,
    Pat,
    PatTop,
    Ty,
    Expr,
    Path,
    Item,
    MetaItem,
}

Parse a prefix of the input as a given syntactic construct.

This is used by macro-by-example parser to implement things like $i:item and the naming of variants follows the naming of macro fragments.

Note that this is generally non-optional – the result is intentionally not Option<Output>. The way MBE work, by the time we try to parse $e:expr we already commit to expression. In other words, this API by design can’t be used to implement “rollback and try another alternative” logic.

Variants

Vis

Block

Stmt

Pat

PatTop

Ty

Expr

Path

Item

MetaItem

Implementations

impl PrefixEntryPoint

pub fn parse(&self, input: &Input, edition: Edition) -> Output

Trait Implementations

impl Debug for PrefixEntryPoint

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

Formats the value using the given formatter.