Parenthesize breaking named expressions in match guards #23316

Job	Run time
pre-commit	23s
mkdocs	2m 15s
cargo fmt	13s
Determine changes	11s
python package	1m 13s
cargo fuzz	4m 37s
benchmarks	6m 7s
cargo clippy	1m 55s
cargo test (linux)	3m 54s
cargo test (wasm)	1m 11s
cargo test (windows)	5m 14s
cargo udeps	1m 59s
formatter instabilities and black similarity	3m 47s
test scripts	49s
test ruff-lsp	15s
ecosystem	5m 56s
	39m 59s

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