errorHandler not catching exceptions in promises with .then() inside v-on

[adamsol]

Version

2.6.11

Reproduction link

https://jsfiddle.net/adamsol/hj6q32v0/

Steps to reproduce

Click the three buttons.

What is expected?

Exceptions for all the buttons should be captured and displayed below.

What is actually happening?

Exception for the second button isn't captured.

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Related to #7653.

I'm using @click="doAction().then(close)" for closing modal windows after successfully finishing async actions. A workaround for exceptions in doAction to be captured by errorHandler is to add () => in the event handler, but it's not obvious.

[posva]

It's not a workaround, it's the proper thing to do if you want to care about the returned value (here the promise)

See the generated code differences: https://template-explorer.vuejs.org/#%3Cdiv%20id%3D%22app%22%3E%0A%20%20%3Cp%3EException%20in%20button2%20%40click%20is%20not%20captured%20by%20errorHandler.%3C%2Fp%3E%0A%20%20%3Cbutton%20%40click%3D%22click(1)%22%3E%0A%20%20%20%20button1%0A%20%20%3C%2Fbutton%3E%0A%20%20%3Cbutton%20%40click%3D%22click(2).then(a%20%3D%3E%20a)%22%3E%0A%20%20%20%20button2%0A%20%20%3C%2Fbutton%3E%0A%20%20%3Cbutton%20%40click%3D%22()%20%3D%3E%20click(3)%22%3E%0A%20%20%20%20button3%0A%20%20%3C%2Fbutton%3E%0A%20%20%3Cp%3E%7B%7B%20message%20%7D%7D%3C%2Fp%3E%0A%3C%2Fdiv%3E%0A

[adamsol]

So why exactly isn't there a return in the generated code in the second case, but there is one in the first case? Is this behaviour documented somewhere?