gistfile1.txt

The transact commit/rollback thing seems like it declares a sort of mini slang.

# some things should be accesible inside the block so we use a is exposed to mark that

my $shared_by_all_transactions;

slang transact {

    my $innards; # the transaction object we are building - created once per each transaction
     
    my sub helper {...} # something
    macro commit is exposed {...}
    macro rollback is exposed {};
    my sub this_one_is_visible_inside {
       ...;
    }
}

The exact details/keywords/sugars haven't been thought out and should subject to bikeshedding before implementation ;)