parser

const (
	LOWEST_PRECEDENCE = 0
	LOWEST            = 1
	WALRUS_EXPR       = 2 // := binds looser than everything except another :=
	CONDITIONAL       = 3 // for conditional expressions (x if cond else y)
	OR                = 4
	BIT_OR            = 5
	BIT_XOR           = 6
	BIT_AND           = 7
	AND               = 8
	EQUALS            = 9
	LESSGREATER       = 10
	BIT_SHIFT         = 11
	SUM               = 12
	PRODUCT           = 13
	POWER             = 14
	PREFIX            = 15
	CALL              = 16
)