llvm-project/clang/TODO.txt

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// Minor random things that can be improved
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Lexer-related diagnostics should point to the problematic character, not the
start of the token.  For example:

int y = 0000\
00080;

diag.c:4:9: error: invalid digit '8' in octal constant
int y = 0000\
        ^

should be:

diag.c:4:9: error: invalid digit '8' in octal constant
00080;
   ^

This specific diagnostic is implemented, but others should be updated.

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