[Issue 5753] Disallow map() of void function

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=5753

RazvanN <razvan.nitu1305 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |razvan.nitu1305 at gmail.com
         Resolution|---                         |WORKSFORME

--- Comment #8 from RazvanN <razvan.nitu1305 at gmail.com> ---
(In reply to Ryuichi OHORI from comment #7)
> It seems that void lambda is not disallowed. DMD2.069 compiles the code
> below, which I think must not:
> 
> void f(T)(T x){}
> 
> unittest
> {
>     import std.algorithm : map;
>     static assert (!__traits(compiles, [1].map!f));
>     static assert ( __traits(compiles, [1].map!(e => f(e))));
> }

I cannot reproduce this on git HEAD (ubuntu 16.04 64-bit). The second static
assert fails with the message "Error: static assert  "Mapping function(s) must
not return void: tuple(__lambda1)"". Closing as WORKSFORME

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