Check for wildcard dependencies recursively

[LukasKalbertodt]

Hi there!

I initially asked this question on SO. The user "Pyfish" wrote a script to do some rudimentary checking (see the his/her answer). I thought it would be awesome to have something like that integrated in a tool and I think your tool comes closest to what I want.

So my feature request: check if there is a wildcard dependency in the dependency graph and emit a warning for every wildcard found.

[kbknapp]

The issue for cargo-outdated is only direct wild cards can be determined, because it uses the Cargo.lock to find versions, not the original crates Cargo.toml.

I'm not against adding this, as I think it'd a really cool feature, but it's a bit beyond what I have time to work on right now. I'll leave this open so that I can start working on it with time. Thanks! :+1: