Error on "PApplet" message caused by AST issues

[shiffman]

Picking up on #3253, the following code snippet:

void setup() {
  float w = random(20, 300);
  float x = random(w, width-w);
  float y = random(w/2, height-w/2);
  text(int(x) + ","  int(y), 50, 50);  // missing + between "," and int(y)
}

produces:

Error on "PApplet"`

I believe it should say:

Error on "int(y)"

(unless it can detect something more specific to the error itself.)

[Manindra29]

This occurs because presently there's no way for the eclipse compiler to differentiate between:
int(4.0) and PApplet.parseInt(4.0). All 'int()' are replaced with PApplet.parseInt() during the preprocessing stage, and at the moment, no book-keeping is done to keep track of which parseInt calls replaced int() calls.

Tldr; it's one of the corner cases for error checking. If this is a relatively common error? Then I can look into how to best handle it.

[shiffman]

Ah, I see it's probably of an edge case but in theory it will pop up anytime there's an error at int(__). Do we have the same issues with errors around color()? My concern here is the use of PApplet which will cause confusion. So two ideas are:

• Grab the token before PApplet.parseInt(). In this case it would then say Error on ",".
• Just change it to say Unknown error (or something like that).