[weberc2]

Go solves this problem by permitting

    foo := Foo{
        x: 10,
        y: 24,
    }

[mercurial]

Also Perl, Python, Javascript and Rust.

[weberc2]

JavaScript doesn't (didn't?) let you put a trailing comma in function parameter lists, annoyingly.

[Arnavion]

Made legal in ES2017.

[teddyh]

But not in JSON, since that is based on ECMA-262 3rd Edition from December 1999.

[teddyh]

Python does this, too.