While the Cargo.toml specifies a license (or licenses), crates also typically include a copy of that license (or licenses) as LICENSE files. This github repo contains the license files but the rustc-demangle-capi crate does not.
FWIW the rustc-demangle crate does include the license files. Can they also be included in the rustc-demangle-capi crate?
As a consumer of third party open source libraries, Chromium is aiming to ensure we include the license files in our own source tree for all of our third-party dependencies, and the rustc-demangle-capi crate is one of a few for which they are missing. Chromium issue: crbug.com/369075726