[Issue 21929] delegates capture do not respect scoping

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21929

--- Comment #15 from Walter Bright <bugzilla at digitalmars.com> ---
The solution I outlined in https://issues.dlang.org/show_bug.cgi?id=21929#c10
which is making it an error is the most reasonable one for the way D works.

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