const testing.markEscape

5 uses

	testing (current package)
		testing.go#L569: 	markEscape   byte = '[' &^ '@' // ^[: escape
		testing.go#L661: 		m, err = w.w.Write([]byte{markEscape, p[i]})
		testing.go#L679: 		case markFraming, markErrBegin, markErrEnd, markEscape:
		testing.go#L1307: 		c = append(c, markEscape, b[j])
		testing.go#L1320: 		case markFraming, markEscape, markErrBegin, markErrEnd:

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