code: def check_namespace_collision( self, namespace_id, block_id, checked_ops ):
          
  
          return self.check_collision( "namespace_id", namespace_id, block_id, checked_ops, OPCODE_NAMESPACE_STATE_CREATIONS )
docs: Are there any colliding namespaces in this block?
          Set the '__collided__' flag and related flags if so, so we don't commit them
          
          Not called directly; called by the @state_create() decorator in blockstack.lib.operations.namespacereveal