math/big: big.Float doesn't satisfy Scanner

[splace]

quote from; https://golang.org/pkg/math/big/

"*Int, *Rat, and *Float satisfy the fmt package's Scanner interface for scanning"

but *Float, (unlike *Int, *Rat), for some reason, doesn’t have a Scan method, so doesn't.

[odeke-em]

I've mailed https://go-review.googlesource.com/30723.

[gopherbot]

CL https://golang.org/cl/30723 mentions this issue.