0a0a5a956c
Properly handle emojis as literal prefix in macros
Do not accept the following
```rust
macro_rules! lexes {($($_:tt)*) => {}}
lexes!(🐛"foo");
```
Before, invalid emoji identifiers were gated during parsing instead of lexing in all cases, but this didn't account for macro pre-expansion of literal prefixes.
Fix #123696.
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||
|---|---|---|
| .. | ||
| diagnostics.rs | ||
| mod.rs | ||
| tokentrees.rs | ||
| unescape_error_reporting.rs | ||
| unicode_chars.rs | ||