const go/token.ADD_ASSIGN

4 uses

	go/token (current package)
		token.go#L52: 	ADD_ASSIGN // +=
		token.go#L156: 	ADD_ASSIGN: "+=",

	go/parser
		parser.go#L1678: 		token.DEFINE, token.ASSIGN, token.ADD_ASSIGN,

	go/scanner
		scanner.go#L866: 			tok = s.switch3(token.ADD, token.ADD_ASSIGN, '+', token.INC)

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