Parser treats "open" as reserved token — desktop.open(file) causes syntax error

[herny83]

Description

The Processing 4.5.2 parser rejects desktop.open(file) with a syntax error.
The method name open appears to be treated as a reserved token in the ANTLR grammar,
but it is not a Java reserved keyword.

Minimal reproduction

void setup() { size(200, 200); }
void draw() { background(0); }
void testOpen() {
  try {
    java.awt.Desktop desktop = java.awt.Desktop.getDesktop();
    java.io.File file = new java.io.File(".");
    desktop.open(file);  // <-- Syntax Error
  } catch (Exception e) {
    println(e.getMessage());
  }
}

Error message

DesktopTest.pde:7:1:7:1: Syntax Error - Error on parameter or method declaration near desktop.open(?

Notes

• desktop.browse(file.toURI()) works fine
• Replacing open with any non-reserved name works
• This code worked in Processing 4.2
• Tested with Processing 4.5.2 CLI on Windows 11

Expected behavior

open should be a valid method name since it is not a Java reserved keyword.