PERL6

pugs> my ($car, @cdr) = (1..10);
pugs> say "my other $car is a {@cdr}";
my other 1 is a 2 3 4 5 6 7 8 9 10

>>7
Not to mention I usually want to print a variable between braces. Another option would be to ONLY accept braces for interoplation, then support any expression inside, kind of like Ruby and unlike Python 3000's format which fails.