closure-ffi 5.1.2

FFI utility for creating bare function pointers that invoke a closure
Documentation 
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import package_version, requests

version = package_version.get_version()
if requests.get(f"https://crates.io/api/v1/crates/closure-ffi/{version}").status_code != 404:
    print(f"error: closure-ffi {version} already exists on crates.io")
    exit(1)