X-Debbugs-CC: Efraim Flashner <efraim@flashner.co.il>

(^ original package author+committer)

rust-pico-sys was added in commit
<https://git.savannah.gnu.org/cgit/guix.git/commit/?id=eda57f4834b29ef17758f7f1f62d3af899e2d669>.

This package bundles PicoHTTPParser.

Fortunately, it is only used by a single dependency: rust-httparser, and 
only for benchmarks (which probably aren't compiled anyway), so simply 
removing the package definition and removing it from rust-httparser' 
#:dev-dependencies should be sufficient.  This appears to work in 
antioxidant.

Greetings,
Maxime.