Function syntex_syntax::parse::classify::expr_requires_semi_to_be_stmt

pub fn expr_requires_semi_to_be_stmt(e: &Expr) -> bool

Does this expression require a semicolon to be treated as a statement? The negation of this: 'can this expression be used as a statement without a semicolon' -- is used as an early-bail-out in the parser so that, for instance, if true {...} else {...} |x| 5 isn't parsed as (if true {...} else {...} | x) | 5