[ruby-core:81190] Re: [Ruby trunk Bug#13564] Exception message management

On 2017/05/15 20:31, [e-mail] wrote:
> I think using Exception#cause for this would be a better way to address this problem.
> However, there is a long-standing bug of the cause not being shown in Exception#inspect and neither by the top-level handler: https://bugs.ruby-lang.org/issues/9918

I agree it is one solution. However, to make sure transparency (for
`rescue` clause which catch the exception later) we need to provide same
error class (`$!.class`).

> @ko1: Could you share your use-case? Modifying an exception message in ensure seems unusual to me.
> In the test_gem_gem_runner.rb, it seems `rescue Exception` would be more intuitive to handle this (but it has the same problem about modifying the message).

My usage is a bit strange. I want to know the status about just before
suspicious code (`require 'rubygems/gem_runner'`) and just after this
line if $! is not nil. Usually we can show such information on STDERR
but test framework (test-all with parallel option) hides all of STDERR
output so that we need to show via Exception message.

I think such usage is not so frequent so that

> Otherwise I think 1-1 + 2 is the best compromise.

I think (1) without (2) (with [Feature #9918]) is acceptable.

Thanks,
Koichi
-- 
// SASADA Koichi at atdot dot net

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