Node: Async generator: catched error on last yield is wrongly rethrown

[nlepage]

• Version: v13.9.0
• Platform: Linux and MacOS
• Subsystem: ?

Also reproduced in v12 but not in v10 or v11.

What steps will reproduce the bug?

async function* gen() {
  try {
    yield 42
  } catch(e) {
    console.log('Error caught!')
  }
}

(async () => {
  const g = gen()
  await g.next() // go to yield 42
  try {
    await g.throw(new Error()) // throw error from the yield
  } catch (e) {
    console.error('e has been rethrown !')
  }
})()

How often does it reproduce? Is there a required condition?

This happens only:

• with async generators
• on the last yield
• without any explicit return (in the generator)

What is the expected behavior?

g.throw() should return a result { done: true, value: undefined }

What do you see instead?

g.throw() rethrows the error.

Additional information

[devsnek]

@nlepage Would you mind opening a bug here: https://bugs.chromium.org/p/v8/issues/list

[Hakerh400]

node bisects to https://github.com/nodejs/node/commit/cfe2484e046f812c762f33b0ecde327d29b2d29d
v8 bisects to https://github.com/v8/v8/commit/b7e935c5af0f7dde968774e3b67dea663a56f806

[nlepage]

V8 bug report: https://bugs.chromium.org/p/v8/issues/detail?id=10238
Chromium bug report: https://bugs.chromium.org/p/chromium/issues/detail?id=1053984