...error should say:

  function `lambdaarg.f(void delegate(int) nothrow dlg)` is not callable using...

...in the delegate, we capture the variable of the function itself where the delegate is...

...lambda2` of type `void delegate(int x) @system` to `void delegate(int)
nothrow`

Note the...

...d => add(d));
    }

    int opApply(scope int delegate(ref T) dg) {
        auto cur=root;
        while...

...each!(d => add(d));
    }
    int opApply(int delegate(ref T) dg) {
        auto cur=start;
        while...

...vibe.http.websockets.WebSocket.send(scope void delegate(scope vibe.http.websockets.OutgoingWebSocketMessage) @safe, vibe...

https://issues.dlang.org/show_bug.cgi?id=24055

Dlang Bot <dlang-bot@dlang.rocks...

https://issues.dlang.org/show_bug.cgi?id=24055

Dlang Bot <dlang-bot@dlang.rocks...

...parameters) does not work on function
                    pointer/delegate types
           Product: D
           Version: D2
          Hardware: All...

...int(ref
rt.sections_elf_shared.DSO) delegate) (in /tmp/temp_7F336C18C4D0)
==117347==    by 0x4398BC...