}

// Format lists the three possible formattings of a quantity.
type Format string

const (
	DecimalExponent = Format("DecimalExponent") // e.g., 12e6
	BinarySI        = Format("BinarySI")        // e.g., 12Mi (12 * 2^20)
	DecimalSI       = Format("DecimalSI")       // e.g., 12M  (12 * 10^6)
)

// MustParse turns the given string into a quantity or panics; for tests
// or other cases where you know the string is valid.

		name                string
		expr                string
		expectEstimatedCost checker.CostEstimate
		expectRuntimeCost   uint64
	}{
		{
			name:                "path",
			expr:                `quantity("12Mi")`,
			expectEstimatedCost: checker.CostEstimate{Min: 1, Max: 1},
			expectRuntimeCost:   1,
		},
		{
			name:                "isQuantity",
			expr:                `isQuantity("20")`,

		{FloatLit, "0p0", "0p0", "'p' exponent requires hexadecimal mantissa"},
		{FloatLit, "1.0P-1", "1.0P-1", "'P' exponent requires hexadecimal mantissa"},

		{ImagLit, "0.i", "0.i", ""},
		{ImagLit, ".123i", ".123i", ""},
		{ImagLit, "123.123i", "123.123i", ""},
		{ImagLit, "123e+0i", "123e+0i", ""},
		{ImagLit, "123.E-10i", "123.E-10i", ""},
		{ImagLit, ".123E+10i", ".123E+10i", ""},

		// hexadecimals
		{IntLit, "0x0", "0x0", ""},

		{token.FLOAT, "1.0P-1", "1.0P-1", "'P' exponent requires hexadecimal mantissa"},

		{token.IMAG, "0.i", "0.i", ""},
		{token.IMAG, ".123i", ".123i", ""},
		{token.IMAG, "123.123i", "123.123i", ""},
		{token.IMAG, "123e+0i", "123e+0i", ""},
		{token.IMAG, "123.E-10i", "123.E-10i", ""},
		{token.IMAG, ".123E+10i", ".123E+10i", ""},

		// hexadecimals

	`0X_dead_cafe.p-10 = 0xdeadcafe.p-10`,
	`0x12_34.P1_2_3 = 0x1234.p123`,
}

var imagTests = []string{
	`1_234i = 1234i`,
	`1_234_567i = 1234567i`,

	`0.i = 0i`,
	`123.i = 123i`,
	`0123.i = 123i`,

	`0.e+1i = 0i`,
	`123.E-1_0i = 123e-10i`,
	`01_23.e123i = 123e123i`,

	`1e-1000000000i = 0i`,
	`1e+1000000000i = ?`,
	`6e5518446744i = ?`,
	`-6e5518446744i = ?`,
}

	c1 := cx128eq_ssa(a, a)
	c2 := cx128eq_ssa(a, b)
	c3 := cx128ne_ssa(a, a)
	c4 := cx128ne_ssa(a, b)

	expectCx128(t, "sum", sum, 4+8i)
	expectCx128(t, "diff", diff, 2+4i)
	expectCx128(t, "prod", prod, -9+12i)
	expectCx128(t, "quot", quot, 3+0i)
	expectCx128(t, "neg", neg, -1-2i)
	expect64(t, "real", r, 1)
	expect64(t, "imag", i, 2)
	expectCx128(t, "cnst", cnst, -4+7i)
	expectTrue(t, fmt.Sprintf("%v==%v", a, a), c1)