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Thread-Topic: Permitting trailing commas in closure use() declarations
Thread-Index: AQHWSjp7mCPFPUp01keDom43SRjbug==
Date: Wed, 24 Jun 2020 15:22:51 +0000
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Subject: Permitting trailing commas in closure use() declarations
From: tysonandre775@hotmail.com (tyson andre)

Hi internals,=0A=
=0A=
https://wiki.php.net/rfc/trailing_comma_in_parameter_list mentioned=0A=
=0A=
> https://wiki.php.net/rfc/list-syntax-trailing-commas Trailing Commas In L=
ist Syntax was a previous proposal to support optional trailing commas in a=
ll list-like structures.=0A=
>=0A=
> Nothing has substantially changed since those RFCs in technical terms, bu=
t I think the aforementioned style > for breaking up large parameter lists =
has become more accepted in the meantime, and features like Constructor Pro=
perty Promotion are going to increase its use further.=0A=
=0A=
So I'm wondering if anyone's interested in revisiting this:=0A=
=0A=
- It'd be easy to forget that function parameters support trailing commas, =
but not closure uses, especially if you're new to the language.=0A=
- Supporting trailing commas in multi-line declarations would make version =
control history easier=0A=
- if you had a closure for which `fn` wouldn't work (a list of values *and =
references* to use, or a list of statements),=0A=
  it'd be convenient to split it up across multiple lines=0A=
=0A=
e.g. =0A=
=0A=
```=0A=
        $incrementing_id =3D 0;=0A=
        return \array_map(static function (array $map) use (=0A=
            $function,=0A=
            $some_data_structure,=0A=
            $some_flag,=0A=
            &$incrementing_id,=0A=
        ): ReturnType {=0A=
```=