1. bool isNonTerminalType(Symbol::\sort(str _))
  2. bool isNonTerminalType(Symbol::\lex(str _))
  3. bool isNonTerminalType(Symbol::\layouts(str _))
  4. bool isNonTerminalType(Symbol::\keywords(str _))
  5. bool isNonTerminalType(Symbol::\parameterized-sort(str _, list[Symbol] _))
  6. bool isNonTerminalType(Symbol::\parameterized-lex(str _, list[Symbol] _))
  7. default bool isNonTerminalType(Symbol s)
Usage import ParseTree; Determine if the given type is a non-terminal typ
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