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Strange behaviour of lambdas depending on curly brackets and return keyword

Description

This works

fn = (x) => arguments writeDump(fn("hello world"))

This also works

fn = (x) => {return arguments;} writeDump(fn("hello world"))

This throws an exception

fn = (x) => {arguments;} writeDump(fn("hello world"))

Example
https://trycf.com/gist/c1c1053c2f8e6487da1f5aad8fd91807/lucee5?theme=monokai

Environment

None

Activity

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Brad Wood 23 September 2019 at 17:49

I believe this behavior is correct if we are matching the JavaScript spec on fat arrows. As soon as you use curly braces, an explicit return is required.

https://stackoverflow.com/questions/35440265/curly-brackets-in-arrow-functions

Brad Wood 14 August 2019 at 13:50

Is this ticket the same as https://luceeserver.atlassian.net/browse/LDEV-1621 ?

Pothys - MitrahSoft 12 September 2017 at 15:33

I've added test case for this ticket & confirmed that issue happened. Issue occurs while using curly braces in arguments & without return keyword.

Pull request: https://github.com/lucee/Lucee/pull/291

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Created 7 September 2017 at 15:00
Updated 23 September 2019 at 17:49

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