code: def find_build_map(stack_builders):
      
      assert isinstance(stack_builders[-1], instrs.STORE_MAP)
  
      to_consume = 0
      for instr in reversed(stack_builders):
          if isinstance(instr, instrs.STORE_MAP):
              # NOTE: This branch should always be hit on the first iteration.
              to_consume += 1
          elif isinstance(instr, instrs.BUILD_MAP):
              to_consume -= instr.arg
              if to_consume <= 0:
                  return instr
      else:
          raise DecompilationError(
              "Couldn't find BUILD_MAP for last element of %s." % stack_builders
          )
docs: Find the BUILD_MAP instruction for which the last element of
      ``stack_builders`` is a store.