Broken indentation when using `$foo.method: bar` syntax

[AlexDaniel]

With the given code, possible ways to indent it are:

my $resp = await Cro::HTTP::Client.patch: $url, :$headers,
           :%body, content-type => ‘application/json’;

Or:

my $resp = await Cro::HTTP::Client.patch: $url, :$headers,
                                          :%body, content-type => ‘application/json’;

However, perl6-mode does this:

my $resp = await Cro::HTTP::Client.patch: $url, :$headers,
:%body, content-type => ‘application/json’;