How to identify lowerings for increment operations or find the source location correctly?

[nshahan]

In the kernel AST for the following code the various forms of incrementing a variable all result in a similar AST structure. If you inspect the .location of each VariableSet node, all point the the source location of the i.

void main() {
  var i = 0;
  i = i + 1;
//^
  i++;
//^
  i += 1;
//^
  ++i;
//  ^
  print(i);
}

This difficulty with this is that I can't tell when the VariableSet came from a lowering of ++i and map the location correctly when compiling the JavaScript in DDC. Is there a way to identify these lowerings? Would it make sense if the VariableSet node pointed to the beginning of the prefix instead?

cc @johnniwinther

[johnniwinther]

I think, if not pointing to i, the VariableSet should point to the operators, i.e. =, ++, += and ++, respectively. Would that be better or worse for your case?