QUESTION_QUESTION_EQ constant Null safety

TokenType const QUESTION_QUESTION_EQ

Implementation

static const TokenType QUESTION_QUESTION_EQ = const TokenType('??=',
    'QUESTION_QUESTION_EQ', ASSIGNMENT_PRECEDENCE, QUESTION_QUESTION_EQ_TOKEN,
    binaryOperatorOfCompoundAssignment: TokenType.QUESTION_QUESTION,
    isOperator: true);