Exception.stack is missing the throwing line in Haxe 4.3.x

[giuppe]

Starting with 4.3.0, getting the stack of an exception via Exception.stack or Exception.details() seems to not contain the throwing line infos anymore; however, ClassStack.exceptionStack() is still the same.

https://try.haxe.org/#6bF30094

import haxe.Exception;
import haxe.CallStack;

class Test {
	static function main() {
		try {
			f1();
		} catch (e) {
			trace("\n stack: " + e.stack);
			trace("\n CallStack.exceptionStack: " + CallStack.toString(CallStack.exceptionStack()));
			trace("\n details: " + e.details());
		}
	}

	static function f1() {
		f2();
	}

	static function f2() {
		var a:Array<Int> = null;
		if(a == null)
			throw "a is null";   // this is line 22
	}
}

The actual exception is thrown on line 22.

This is the output in 4.3.0 and 4.3.1 (tested in neko, hashlink, hxcpp):

Test.hx:9: 
 stack: 
Called from Test.hx line 16
Called from Test.hx line 7
Test.hx:10: 
 CallStack.exceptionStack: 
Called from Test.hx line 22
Called from Test.hx line 16
Called from Test.hx line 7
Test.hx:11: 
 details: Exception: a is null
Called from Test.hx line 16
Called from Test.hx line 7

Although in 4.2.5:

Test.hx:9: 
 stack: 
Called from Test.hx line 21
Called from Test.hx line 16
Called from Test.hx line 7
Called from ? line 1
Test.hx:10: 
 CallStack.exceptionStack: 
Called from Test.hx line 21
Called from Test.hx line 16
Called from Test.hx line 7
Test.hx:11: 
 details: Exception: a is null
Called from Test.hx line 21
Called from Test.hx line 16
Called from Test.hx line 7
Called from ? line 1

I made other experiments:

• If the exception is thrown via something like:

var a:Array<Int> = null;
trace(a.length);  // Null access .length

Then only CallStack.exceptionStack contains the throwing line, even in Haxe 4.2.x.

• If the exception is thrown by explicitly creating an Exception object, the throwing line is present everywhere:

var a:Array<Int> = null;
if(a == null)
    throw new Exception("a is null");

Is this a bug, or are we supposed to get the throwing line in some other way?

[kLabz]

Bisected to fb52486 / #10519