Inconsistency with function pointers

[Russel Winder]

I am sure I am just missing something simple, but I need the nudge…

I can do:

        import core.thread ;
        import std.stdio ;
        
        int main(immutable string[] args) {
          auto f() { return delegate () { writeln("Hello World."); }; }
          auto t = new Thread(f);
          t.start();
          t.join();
          return 0;
        }

it is Thread(f) rather than Thread(&f) because f is a function returning
a void delegate() rather than being a void(). However:

        import core.thread ;
        import std.stdio ;
        
        int main(immutable string[] args) {
          auto t = new Thread( delegate () { return delegate () { writeln("Hello World."); }; } ) ;
          t.start();
          t.join();
          return 0;
        }

trial.d(7): Error: constructor core.thread.Thread.this (void function()
fn, ulong sz = cast(ulong)0) is not callable using argument types (void
delegate() delegate() pure nothrow @safe)
Failed: 'dmd' '-v' '-o-' 'trial.d' '-I.'

So I cannot use an anonymous delegate where I can use a named delegate?
-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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