Fix panic with invalid unicode query #645
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Without this fix the panic looks like the following: ```rust ---- parser::tests::lexer::string_errors stdout ---- thread 'parser::tests::lexer::string_errors' panicked at 'byte index 4 is not a char boundary; it is inside 'ɠ' (bytes 3..5) of `"\uɠ^A`', src/libcore/str/mod.rs:2219:5 ``` This was found via fuzzing with `cargo-fuzz`.
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Without this fix the panic looks like the following:
This was found via fuzzing with
cargo-fuzz.