[Issue 19679] variable escapes unnoticed when referenced in function called from function whose address is taken

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19679

--- Comment #2 from FeepingCreature <default_357-line at yahoo.de> ---
Seems a good start. Wanna open a PR so we can GTM? If they don't like it, they
can always request changes. Most of all I want to get it into the testsuite,
even with an inadequate fix, instead of waiting for a better one that may come
whenever.

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