Avoid applying PEP 646 rewrites in invalid contexts #35344

Job	Run time
Determine changes	9s
mkdocs	2m 43s
pre-commit	56s
cargo fmt	18s
python package	1m 15s
cargo build (msrv)	3m 41s
benchmarks	4m 34s
cargo build (release)	4m 52s
cargo clippy	1m 52s
cargo fuzz	4m 49s
cargo shear	25s
cargo test (linux)	4m 13s
cargo test (wasm)	1m 25s
cargo test (windows)	8m 38s
formatter instabilities and black similarity	0s
test scripts	58s
ecosystem	8m 41s
test ruff-lsp	51s
Fuzz the parser	0s
	50m 20s

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