The anymap crate does not appear to be maintained, and the most recent published version 0.12.1 includes a soundness bug. This has been fixed a few years ago, but was never released.
anymap
{ "license": "CC0-1.0" }
{ "affected_functions": null, "affects": { "arch": [], "functions": [], "os": [] } }
null
"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2021-0065.json"
[]
"unmaintained"