Fix hang when parsing unclosed comment #116

Job	Run time
windows-latest-default-Release	2m 57s
windows-latest-default-Debug	4m 17s
windows-latest-llvm-arm64-Release	4m 36s
windows-latest-llvm-arm64-Debug	4m 16s
windows-latest-msvc-arm64-Release	4m 56s
windows-latest-msvc-arm64-Debug	5m 25s
macos-latest-default-Release	3m 24s
macos-latest-default-Debug	4m 23s
ubuntu-latest-default-Release	4m 26s
ubuntu-latest-default-Debug	4m 19s
	42m 59s

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