Macro tt_call::tt_is_ident

macro_rules! tt_is_ident {
    { $caller : tt input = [{ $ident : ident }] } => { ... };
    { $caller : tt input = [{ $other : tt }] } => { ... };
}

Predicate that accepts a single token and determines whether it is an identifier. ^[tt-call]

An identifier is anything that matches Rust’s $:ident fragment.

Input

• input = [{ a single token tree }]

Output

• is_ident = [{ either true or false }]