[Issue 17645] `pure` is transitively applied to all delegates inside a pure function

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17645

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
FWIW, the test case works in DMD 2.013 through 2.027 :)

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