040000 tree e436e362935272ec98e5a17c9ab09b629cee891e	ostream.joiner.cons
040000 tree 4740651d633cb890da327ac9eab7d4a2f6cb102e	ostream.joiner.creation
040000 tree 8e2e0c58ea9fc7be3236a0a1feeef3655ef75961	ostream.joiner.ops