The current master branch your PR based on already should work, because this has a fix (#5); it uses a macro to solve the type incompatibility issue. There's no need to add a redundant try_into on a literal number macro IOCTL_FICLONE!().

Yes, #5 fixed the problem, but it seems it hasn't been released in the next version.

I apologize for the duplication. Closing now.

For others that found reflink (0.1.3) doesn't work, try to overwrite the the dependency source as the following in Cargo.toml:

[patch.crates-io]
reflink = { git = "https://github.com/nicokoch/reflink.git" }