const internal/abi.bitsetLSB 2 uses internal/abi (current package) map.go#L26: bitsetLSB = 0x0101010101010101 map.go#L29: MapCtrlEmpty = bitsetLSB * uint64(ctrlEmpty)
The pages are generated with Golds v0.8.4. (GOOS=linux GOARCH=amd64)