Struct ExprLet
pub struct ExprLet {
pub attrs: Vec<Attribute>,
pub let_token: Let,
pub pat: Box<Pat>,
pub eq_token: Eq,
pub expr: Box<Expr>,
}Iterator<Item = &Expr>
node: &ExprLet
[node.expr.as_ref()]Iterator<Item = &mut Expr>
node: &mut ExprLet
[node.expr.as_mut()]