Exception#cause should be shown in output and #inspect
Exception#cause has been added in Feature #8257.
But the cause is never shown, one needs to inspect exc.cause to know the cause.
The cause should be shown by default, for instance:
begin raise "cause" rescue raise "wrapper" end
-:4:in `rescue in <main>': wrapper (RuntimeError) from -:1:in `<main>' Caused by: -e:1:in `<main>': org (RuntimeError)
And not only the first 2 lines.
Logically, #inspect should also include the cause such as:
#<RuntimeError: wrapper cause:#<RuntimeError: org>>
What do you think?