Cannot use BlockIDHash for fetching rights

[utdrmac]

bakingRightsFilter := rpc.BakingRightsInput{
	BlockID:     rpc.BlockIDHash("BLzGD63HA4RP8Fh5xEtvdQSMKa2WzJMZjQPNVUc4Rqy8Lh5BEY1"),
	Level:       nextLevelToBake,
	Delegate:    (*bakerPkh),
	MaxPriority: maxBakePriority,
}

cannot use rpc.BlockIDHash("BLzGD63HA4RP8Fh5xEtvdQSMKa2WzJMZjQPNVUc4Rqy8Lh5BEY1") (type rpc.BlockIDHash) as type rpc.BlockID in field value:
rpc.BlockIDHash does not implement rpc.BlockID (ID method has pointer receiver)

[utdrmac]

Umm... what?

var h rpc.BlockIDHash = block.Hash

./baking.go:83:6: cannot use block.Hash (type string) as type rpc.BlockIDHash in assignment

Yet this works: var h rpc.BlockIDHash = "BLzGD63HA4RP8Fh5xEtvdQSMKa2WzJMZjQPNVUc4Rqy8Lh5BEY1"

Both strings, why doesn't the above work?