used assert macro with a literal bool

[Serein-ly]

used assert macro with a literal bool

[Dylan-DPC]

Hi. Thanks for the contribution. Can you squash this to 1 commit? (you can do an interactive rebase for that )

[Serein-ly]

嗨。感谢您的贡献。您能把这个压缩为 1 个提交吗？（您可以为此进行交互式变基）

Okay, the two commits have been merged

[szabgab]

@bin-ly this looks good. In the future it would be cleaner if you created a branch on your clone and on your fork and sent the PR from that branch and not from your master branch.

[rustbot]

:umbrella: The latest upstream changes (possibly #2681) made this pull request unmergeable. Please resolve the merge conflicts.