[Issue 15437] New: documentation for typeof(someTemplate) == void

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15437

          Issue ID: 15437
           Summary: documentation for typeof(someTemplate) == void
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dlang.org
          Assignee: nobody at puremagic.com
          Reporter: luis at luismarques.eu

Consider this:

    auto tee(alias fun, Flag!"pipeOnPop" pipeOnPop = Yes.pipeOnPop, R1)(R1
inputRange) if (is(typeof(fun) == void) || isSomeFunction!fun);

It is not immediately obvious in what situation `fun` would have (typeof(fun)
== void) unless you know that templates received through an alias have typeof
void, but there doesn't seem to be any place in the documentation mentioning
that fact.

Even if this is mentioned in the docs somewhere, it might still be worth
redundantly mentioning this in more than one place. Consider the sections on
AliasDeclaration and typeof (part of the declaration docs), and the Template
docs.

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