Fix idempotency issue of comments after match arm#4768

whizsid wants to merge 2 commits intorust-lang:rustfmt-2.0.0-rc.2rust-lang/rustfmt:rustfmt-2.0.0-rc.2from

whizsid:idemptonent_cmnt_aftr_matchwhizsid/rustfmt:idemptonent_cmnt_aftr_matchCopy head branch name to clipboard