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The syn crate has gained support for let_else syntax in version 1.0.76, see dtolnay/syn#1057 . In the three instances that use let_else, we've sent code through an attr macro, which would create compile errors when there was no let_else support in syn. To avoid this, we ran `cargo +nightly update -p syn` for updating the syn crate.
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Closes #1050.