Fix a clippy::collapsible_match lint #2642
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We don't use the suggestion here, because it's actually wrong. See rust-lang/rust-clippy#7575
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Motivation
Clippy is suggesting that we collapse a nested
match ... { if let ... { ... } }.However, the suggestion is actually wrong:
rust-lang/rust-clippy#7575
This lint only seems to be on nightly right now, but eventually it will cause our CI to fail.
Solution
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Anyone can review this tiny fix.
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