message: Test we can extract error instances
diff: @@ -556,6 +556,14 @@ console.log("How are you doing?");`,
  read: new Selection([1, 9], [3, 8]),
  update: Selection.cursorAt(1, 2)
  }
  + ],
  + [
  + "an error instance",
  + {
  + code: `console.log(new Error("It failed"))`,
  + selection: Selection.cursorAt(0, 14)
  + },
  + { read: new Selection([0, 12], [0, 34]) }
  ]
  ])("should extract %s", async (_, context, expectedSelection) => {
  await doExtractVariable(context.code, context.selection);
  