Function sc_executor::with_externalities_safe

pub fn with_externalities_safe<F, U>(
    ext: &mut dyn Externalities, 
    f: F
) -> Result<U> where
    F: UnwindSafe + FnOnce() -> U, 

Set up the externalities and safe calling environment to execute runtime calls.

If the inner closure panics, it will be caught and return an error.