Avoid consuming newline for unterminated string #29945

Job	Run time
cargo fmt	19s
Determine changes	12s
mkdocs	2m 24s
pre-commit	35s
python package	1m 17s
benchmarks	5m 39s
cargo build (msrv)	2m 57s
cargo build (release)	6m 35s
cargo clippy	3m 39s
cargo fuzz	4m 14s
cargo shear	25s
cargo test (linux)	6m 17s
cargo test (wasm)	1m 21s
cargo test (windows)	7m 30s
test scripts	2m 7s
formatter instabilities and black similarity	5m 24s
test ruff-lsp	59s
ecosystem	15m 20s
Fuzz the parser	5m 30s
	1h 12m 44s

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