nl_tokens: Checks class range
pl_tokens: function checkClassRange ( from , to ) { if ( from . <mask> === 'control' || to . kind === 'control' || ( ! isNaN ( from . codePoint ) && ! isNaN ( to . codePoint ) && from . codePoint > to . codePoint ) ) { throw new SyntaxError ( ` ${ from . value } ${ to . value } ` ) ; } }