Enum DeclarationConstructorInitializer 

pub enum DeclarationConstructorInitializer<'tree> {
    Arguments(Node<'tree>),
    Expression(Node<'tree>),
    Empty,
}

How a T var ...; declaration initializes its object.

Variants

Arguments(Node<'tree>)

Direct initialization, T var(args) or T var{args}: the argument list the declaration hands the constructor.

Expression(Node<'tree>)

Copy initialization from one expression, T var = expr, which supplies a single constructor argument without spelling an argument list.

Empty

T var;, which names no constructor argument at all.