variableToken method
Implementation
Parser<String> variableToken() => ref2(
token,
seq2(pattern('A-Z_'), pattern('A-Za-z0-9_').starString()),
'Variable expected',
);
Parser<String> variableToken() => ref2(
token,
seq2(pattern('A-Z_'), pattern('A-Za-z0-9_').starString()),
'Variable expected',
);