https://issues.dlang.org/show_bug.cgi?id=20246

          Issue ID: 20246
           Summary: isCallable fails for template opCall overload
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: snarwin+bugzilla@gmail.com

import std.traits: isCallable;

struct S { int opCall(T)(T) { return 0; } }

static assert(isCallable!(S.init));

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The above static assert should pass, but instead fails.

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