https://RustRocket.rs -- Cloud Monk Losang Jinpa, Ph.D., MCSE / MCT, https://Rustaceans.rs, Full Stack Cloud Native Rust DevOps Engineer - Rocket Framework Rust Microservices on Kubernetes-AWS-Azure-GCP

“closure - a (1) closure object or (2) closure type. Local Types ’11 (87), Lambdas (578), Generic Lambdas (982), Lambda Captures (986), auto Return (1197)” (EMCppSfe 2021)