[Issue 19842] std.signals Segfault when connecting with a lambda

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19842

--- Comment #3 from Dlang Bot <dlang-bot at dlang.rocks> ---
@dukc created dlang/phobos pull request #8139 "Issue 19842 - only class member
functions must be used be used as slots" mentioning this issue:

- Issue 19842 - only class member functions must be used be used as slots

https://github.com/dlang/phobos/pull/8139

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