Macro call_inspectors 

macro_rules! call_inspectors {
    ([$($inspector:expr),+ $(,)?], |$id:ident $(,)?| $body:expr $(,)?) => { ... };
    (#[ret] [$($inspector:expr),+ $(,)?], |$id:ident $(,)?| $body:expr $(,)?) => { ... };
}

Helper macro to call the same method on multiple inspectors without resorting to dynamic dispatch.