On Monday, 8 December 2014 at 20:08:35 UTC, Gary Willoughby wrote:
import std.stdio;
import std.functional;

class Foo(T, alias greater = "a > b") if (is(typeof(binaryFun!(greater)(T.init, T.init)) == bool))
{
        private alias compare = binaryFun!(greater);

        public this()
        {
                writefln("%s", this.compare(2, 1));
        }
}

void main(string[] args)
{
        auto foo = new Foo!(int, "a < b"); // Works

auto bar = new Foo!(int, delegate(int a, int b){ return a > b; }); // Linker error.
}

Looks like a compiler bug.

A call without "this." works. When you insert a call without
"this.", other calls with "this." work, too.

A delegate with an implicit parameter type works: `Foo!(int,
delegate(int a, /*!*/ b){ return a > b;})`.

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