Unable to use class constants as array-key type

[marcosh]

https://psalm.dev/r/f63080e0d7

With code

class Foo
{
	public const string BAR = 'asdf';
}

/**
 * @var array{Foo::BAR : string} $a
 */
$a = [Foo::BAR => 'ewqrtq'];

I get the error

ERROR: [InvalidDocblock](https://psalm.dev/008) - 11:1 - array{Foo::BAR : string} is not a valid type (:: in array key is only allowed for ::class

Is there a way to use a class constant as array key in a type definition?

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/f63080e0d7

<?php

class Foo
{
	public const string BAR = 'asdf';
}

/**
 * @var array{Foo::BAR : string} $a
 */
$a = [Foo::BAR => 'ewqrtq'];

Psalm output (using commit 03ee02c):

ERROR: InvalidDocblock - 11:1 - array{Foo::BAR : string} is not a valid type (:: in array key is only allowed for ::class in /var/www/vhosts/psalm.dev/httpdocs/src/somefile.php:8)

INFO: UnusedVariable - 11:1 - $a is never referenced or the value is not used