test/mjsunit/regress/regress-325676.js

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// Flags: --expose-debug-as debug

// If a function parameter is forced to be context allocated,
// debug evaluate need to resolve it to a context slot instead of
// parameter slot on the stack.

var Debug = debug.Debug;

var expected;
var exception = null;

function listener(event, exec_state, event_data, data) {
  if (event != Debug.DebugEvent.Break) return;
  try {
    assertEquals(expected, exec_state.frame(0).evaluate('arg').value());
    exec_state.frame(0).evaluate('arg = "evaluated";');  // no effect
  } catch (e) {
    exception = e;
  }
}

Debug.setListener(listener);

function f(arg) {
  expected = arg;
  debugger;
  assertEquals("evaluated", arg);

  arg = "value";
  expected = arg;
  debugger;
  assertEquals("evaluated", arg);

  // Forces arg to be context allocated even though a parameter.
  function g() { arg; }
}

f();
f(1);
f(1, 2);

assertNull(exception);