cargo_vendor doesnt account for sources not from crates.io

[K1ngfish3r]

Trying to vendor zed, I came across github sources being vendored as part of the command. When running cargo vendor > .cargo/config.toml, it looks something like this

[source.crates-io]
replace-with = "vendored-sources"

[source."git+https://github.com/KillTheMule/nvim-rs?branch=master"]
git = "https://github.com/KillTheMule/nvim-rs"
branch = "master"
replace-with = "vendored-sources"

[12 sources]...

[source."git+https://github.com/zed-industries/lsp-types?rev=72357d6f6d212bdffba3b5ef4b31d8ca856058e7"]
git = "https://github.com/zed-industries/lsp-types"
rev = "72357d6f6d212bdffba3b5ef4b31d8ca856058e7"
replace-with = "vendored-sources"

[source.vendored-sources]
directory = "vendor"

Whilst the vendor tarball is created with those deps, Autospec currently doesn't echo in the github sources to account for this, and the builder tries to access the internet.

[K1ngfish3r]

I tried v16 and I'm currently unable to see anything being appended to .cargo/config,toml automatically. I believe this behaviour will also affect other rust packages

[K1ngfish3r]

can confirm working with v16 after sync to 42020