I wonder if the author is aware that rust has a well working, well searchable documentations you can easily open locally in case you have no internet ("rustup doc" & "cargo doc --open").

> You check the documentation of that crate and indeed, you find the write_u16 method there; phew.

Like, all wild card impl. traits are in the documentation, including such which are dereferenced.

EDIT: Just to be clear if you pull in other code, including potential traits, you need to open the documentation specific to your crate (cargo doc).