nl_tokens: Parses the ( ... ) component of an array pattern .
pl_tokens: function parseArrayList ( node ) { consume ( ) ; // '(' // a() matches the empty list. if ( peek ( ) === ')' ) { node . type = '()' ; return ; } while ( true ) { // The whole array may be matched with 'a(|)' or (preferably) 'a'. if ( peek ( ) === '|' ) { break ; } /**
         * Use clear() to allow whitespace on certain locations:
         * (n,n@x), (n, n@x), ( n , n@x ) are all accepted.
         * (n, n @x) is not accepted: bindings do not allow
         * any whitespace.
         */ clear ( ) ; stage1 ( node . nodes ) ; <mask> ( ) ; if ( peek ( ) !== ',' ) { break ; } consume ( ) ; // ',' } }