Keyword constructor
const
Keyword(})
Initialize a newly created keyword.
Implementation
const Keyword(String lexeme, String name, this.keywordStyle,
{bool isModifier: false,
bool isTopLevelKeyword: false,
int precedence: NO_PRECEDENCE})
: super(lexeme, name, precedence, KEYWORD_TOKEN,
isModifier: isModifier, isTopLevelKeyword: isTopLevelKeyword);