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fix(expand): prevent infinity loop in macro containing only "///" by b...
source link: https://github.com/rust-lang/rust/pull/112345
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Fixes #112342
Issue #112342 was caused by an infinity loop in parse_tt_inner, and the state of it is as follows:
-
matcher:[Sequence, Token(Doc), SequenceKleeneOpNoSep(op: ZeroOrMore), Eof] -
loop:
| Iteration | Action |
|---|---|
| 0 | enter Sequence |
| 1 | enter Token(Doc) and mp.idx += 1 had been executed |
| 2 | enter SequenceKleeneOpNoSep and reset mp.idx to 1 |
| 3 | enter Token(Doc) again |
To prevent the infinite loop, a check for whether it only contains DocComment in check_lhs_no_empty_seq had been added.
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