[Issue 13293] `typeof(<function returning T>)` gets printed as `T()`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13293

--- Comment #3 from hsteoh at quickfur.ath.cx ---
I'd expect something like `Result function()` or something along those lines,
rather than `Result()` which looks like a ctor invocation.

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