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24c432608f
In order to not regress the quality of compile errors, some improvements
had to be made.
* std.zig.parseCharLiteral is improved to return more detailed parse
failure information.
* tokenizer is improved to handle null bytes in the middle of strings,
character literals, and line comments.
* validating how many unicode escape digits in string literals is moved
to std.zig.parseStringLiteral rather than handled in the tokenizer.
* when a tokenizer error occurs, if the reported token is the 'invalid'
tag, an error note is added to point to the invalid byte location.
Further improvements would be:
- Mention the expected set of allowed bytes at this location.
- Display the invalid byte (if printable, print it, otherwise
escape-print it).