Macro lambda_runtime::lambda

macro_rules! lambda {
    ($handler:ident) => { ... };
    ($handler:ident, $runtime:expr) => { ... };
    ($handler:expr) => { ... };
    ($handler:expr, $runtime:expr) => { ... };
}

Initializes the Lambda runtime with the given handler. Optionally this macro can also receive a customized instance of Tokio runtime to drive internal lambda operations to completion