Error messages refer to structopt 3.0

[dtolnay]

structopt/structopt-derive/src/parse.rs

Line 74 in c72ad2f

span_error!(lit.span(), "`#[structopt({} = \"\") is deprecated in structopt 3.0, now it's default behavior", s);

structopt/structopt-derive/src/parse.rs

Line 133 in c72ad2f

"`#[structopt(raw(...))` attributes are deprecated in structopt 3.0, only `raw(true)` and `raw(false)` are allowed")

structopt/structopt-derive/src/parse.rs

Line 157 in c72ad2f

"#[structopt(version)] is invalid attribute, structopt 3.0 inherits version from Cargo.toml by default, no attribute needed")

These errors are confusing because structopt is currently on version 0.3.

[CreepySkeleton]

This messages are intentional - they are meant to help people move from 0.2 to 0.3. For example, let's take raw attrs are deprecated message - in 0.2 there were magical raw attributes, they are gone in 0.3 but a user could accidentally try to use it just because they used to. We emit explicit error that explains the reasoning instead of generating Arg::raw method call with wrong arguments. The story is similar for other messages.

Any propositions on smoothing migrating experience are appreciated.

[dtolnay]

That's fine, but the error messages should say 0.3, not 3.0.

[CreepySkeleton]

Dammit. I knew I missed something