Macro julia::jl_catch

macro_rules! jl_catch {
    () => { ... };
    (|$ex:ident| $body:expr) => { ... };
    (|$ex:ident -> $t:ty| $body:expr) => { ... };
}

This macro checks for exceptions that might have occurred in the sys::* functions. Should be used after calling any jl_* function that might throw an exception.