https://github.com/ugexe/rakudo/commit/ca37a7d669a296d339b2a50b141c3d225f84b2f0

-e.pl

# Install a distribution in $*CWD

my $dist = Distribution::Path.new($*CWD);
my $CURI = CompUnit::RepositoryRegistry.repository-for-name("site");
$cur.install($dist);

abstract.pl

# Distribution::<Meta Type>[does Distribution::Storage::<Storage Type>]

# Distribution::Hash[::Storage = Distribution::Storage::Directory].new(%meta-hash, path => $storage-path);
Distribution::Hash.new(%meta-hash, path => $*CWD);
Distribution::Hash[Distribution::Storage::GitHub].new(%meta-hash,  uri => 'github.com/foo/bar');

# Distribution::Path[::Storage = Distribution::Storage::Directory].new($path-to-meta);
Distribution::Path.new($*CWD);
Distribution::Path[Distribution::Storage::GitHub].new($path-to-meta, uri => 'github.com/foo/bar');

install-core-dist.pl

# Distribution::Hash

my %provides = 
    "Test"                       => "lib/Test.pm6",
    "NativeCall"                 => "lib/NativeCall.pm6",
    "NativeCall::Types"          => "lib/NativeCall/Types.pm6",
    "NativeCall::Compiler::GNU"  => "lib/NativeCall/Compiler/GNU.pm6",
    "NativeCall::Compiler::MSVC" => "lib/NativeCall/Compiler/MSVC.pm6",
    "Pod::To::Text"              => "lib/Pod/To/Text.pm6",
    "newline"                    => "lib/newline.pm6",
    "experimental"               => "lib/experimental.pm6",
;
my %meta =
    name     => "CORE",
    auth     => "perl",
    ver      => $*PERL.version.Str,
    provides => %provides,
;
$*REPO.install: Distribution::Hash.new(%meta, :path($*CWD)), :force;