my @hashrefs = map { foo => $_ }, 1..5;

##</code><code>##

        map {( "$foo$bar" => "barfoo" )} 1, ;      #no more syntax error :-)
        map +( "$foo$bar" => "barfoo" ), 1, ;      #note unary + 
                                                   #to avoid "function-like" 
                                                   #interpretation of ()