[ruby-core:117371] [Ruby master Bug#20401] Duplicated when clause warning line number

["mame (Yusuke Endoh) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20401 has been updated by mame (Yusuke Endoh).


This behavior was discovered and briefly discussed during the previous dev meeting. The actual warning is

```
test.rb:4: warning: duplicated 'when' clause with line 2 is ignored
```

According to @nobu, this reads "The 'when' clause at line 4 duplicates (conflicts) with (a 'when' clause at) line 2. This is ignored."

Anyway I agree that it is too confusing. I think it would be good if they could improve the English.

----------------------------------------
Bug #20401: Duplicated when clause warning line number
https://bugs.ruby-lang.org/issues/20401#change-107529

* Author: kddnewton (Kevin Newton)
* Status: Open
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
When you have a duplicated when clause, you get a warning for it. For example:

```ruby
case foo
when :bar
when :baz
when :bar
end
```

you get `warning: duplicated `when' clause with line 2 is ignored`.

But the when clause that is ignored is the one on line 4, not line 2. It seems like it's warning for the wrong line.



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