Call stack

[RealyUniqueName]

haxe.CallStack.callStack() and haxe.CallStack.exceptionStack() should contain valid stack including suspend points. Maybe add a Suspend(item:StackItem) constructor to StackItem enum. Example:

class Test {
  async function root() {
    await timerDelay(3000);
    await level1();
  }

  async function level1() {
    level2();
  }

  async function level2() {
    throw "Terrible error";
  }
}

Exception stack for Terrible error should be like this:

Method('Test', 'root');
Suspend(Method('Test', 'level1'));
Method('Test', 'level2');

[nadako]

That's an important thing to consider. However, having this always enabled will have a negative effect on performance, so maybe this should only be enabled with -debug or some other flag.

[RealyUniqueName]

In my implementation i collect positions of async stack at compile time as strings, which is pretty cheap. And then attach a runtime stack clipped from the place it was requested to the nearest await.