const testing.markErrEnd

4 uses

	testing (current package)
		testing.go#L568: 	markErrEnd   byte = 'N' &^ '@' // ^N: end of error
		testing.go#L679: 		case markFraming, markErrBegin, markErrEnd, markEscape:
		testing.go#L1282: 		strErrEnd = string(markErrEnd)
		testing.go#L1320: 		case markFraming, markEscape, markErrBegin, markErrEnd:

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