fix issue-144595

[bb1yd]

I close the previous PR because it's too messy

relevant issue:#144595

I fix this issue by calling look_ahead to check if the user write a name field in the tuple struct, then try to recover after calling parse_ty

[rustbot]

The parser was modified, potentially altering the grammar of (stable) Rust
which would be a breaking change.

cc @fmease

[rustbot]

r? @mejrs

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[qaijuang]

No test ?

[bb1yd]

I have added a test. Thank you.

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.