const golang.org/x/text/cases.isMidBit

3 uses

	golang.org/x/text/cases (current package)
		trieval.go#L47: 	isMidBit       = 1 << 6
		trieval.go#L104: 	return c&(fullCasedMask|isMidBit) == isMidBit|cIgnorableUncased

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)