I definitely made this work at some point:
https://hg.mozilla.org/try/rev/18dc070e0308

The main difference with what you seem to be doing is that my version
points directly into third-party/rust, which I think is preferable anyway.

On Fri, Apr 28, 2017 at 10:05 AM, Josh Matthews <j...@joshmatthews.net>
wrote:

> Back in February there was a discussion about how hard it is to modify
> vendored Rust crates for Stylo. I can't actually find any solution to that
> problem - the general idea appears to be "add a [replace] section to a
> Cargo.toml and run cargo update", but I have not been able to make that
> work yet. Given that the version of mozilla-central that I'm using contains
> a vendored copy of rust-cssparser 0.12.2, here's what I have tried:
>
> * added the following to servo/Cargo.toml and toolkit/library/rust:
> [replace]
> "rust-cssparser:0.12.2" = { path = "/Users/jdm/src/rust-cssparser" }
>
> * run `cd servo/Cargo.toml && cargo update -p cssparser`
> * run `cd toolkit/library/rust && cargo update -p cssparser`
>
> This ends up modifying the Cargo.lock files to use the most recent version
> from crates.io (0.12.4) instead of my local copy. Has anybody been able
> to make this work? Can we please document the exact steps to follow? There
> have been multiple people asking in #servo how to do this recently and
> nobody seems to have done it successfully.
>
> Cheers,
> Josh
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>
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