Ruby

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 

Should output:

-: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?