Patterns for functions in template parameters

[via Digitalmars-d-learn]

On Friday, 24 October 2014 at 14:06:08 UTC, ketmar via 
Digitalmars-d-learn wrote:
> On Thu, 23 Oct 2014 18:28:04 +0000
> Max Samukha via Digitalmars-d-learn 
> <digitalmars-d-learn at puremagic.com>
> wrote:
>
> um-hm... maybe this:
>
>   void Foo(T, U) (T delegate (U) a) {
>     // here T is bool, U is int for the following sample
>     import std.stdio;
>     writeln(a(3));
>   }
>
>   Foo((int x) => x%2 == 0);

I thought the same thing, but it doesn't compile with DMD from 
Git:

test.d(7): Error: function declaration without return type. (Note 
that constructors are always named 'this')
test.d(7): Error: found '=>' when expecting ')'
test.d(7): Error: no identifier for declarator Foo(int x)
test.d(7): Error: semicolon expected following function 
declaration
test.d(7): Error: no identifier for declarator x
test.d(7): Error: Declaration expected, not '%'