https://crates.io/crates/rib-lang says license is "non-standard", same for https://crates.io/crates/rib-repl. That's because you're pointing Cargo.toml to a file, not a known license identifier: https://github.com/golemcloud/rib/blob/e4d2f0edc700e8f1f46aad0ef33745e040118577/rib-repl/Cargo.toml#L9 https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields
https://crates.io/crates/rib-lang says license is "non-standard", same for https://crates.io/crates/rib-repl. That's because you're pointing Cargo.toml to a file, not a known license identifier:
rib/rib-repl/Cargo.toml
Line 9 in e4d2f0e
https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields