Questionable Bidding And Poor Defence

Dealer: South
Vuln: Game All
Scoring: IMPs

Green square in centre
  1. spadeK 6 5 2
  2. heartQ J 10 3 2
  3. diamondJ 9 5
  4. club7
West North East South
Pass
1diamond 2spade* ???

* Shows both black suits

After a 1diamond opener from partner North bids a Marmic 2spade to show the black suits. What, if anything, do you bid?
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