parser: Tweak function parameter parsing to avoid rollback on succesfull path #54415
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parser: Tweak function parameter parsing to avoid rollback on succesfull path Since rollback is not perfect and may e.g. leave non-fatal errors after it, we need to make sure compilation fails if it happens. So in particular case of `fn parse_arg_general` we need to parse the "good" `TYPE` first and only then rollback and recover erroneous `PAT: TYPE` if necessary. Found when working on rust-lang/rfcs#2544 (comment). r? @ghost
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Rollup of 16 pull requests Successful merges: - #53652 (define copy_within on slices) - #54261 (Make `dyn` a keyword in the 2018 edition) - #54280 (remove (more) CAS API from Atomic* types where not natively supported) - #54323 (rustbuild: drop color handling) - #54350 (Support specifying edition in doc test) - #54370 (Improve handling of type bounds in `bit_set.rs`.) - #54371 (add -Zui-testing to rustdoc) - #54374 (Make 'proc_macro::MultiSpan' public.) - #54402 (Use no_default_libraries for all NetBSD flavors) - #54409 (Detect `for _ in in bar {}` typo) - #54412 (add applicability to span_suggestion call) - #54413 (Add UI test for deref recursion limit printing twice) - #54415 (parser: Tweak function parameter parsing to avoid rollback on succesfull path) - #54420 (Compress `Liveness` data some more.) - #54422 (Simplify slice's first(_mut) and last(_mut) with get) - #54446 (Unify christianpoveda's emails) Failed merges: - #54058 (Introduce the partition_dedup/by/by_key methods for slices) r? @ghost
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Rollup of 16 pull requests Successful merges: - #53652 (define copy_within on slices) - #54261 (Make `dyn` a keyword in the 2018 edition) - #54280 (remove (more) CAS API from Atomic* types where not natively supported) - #54323 (rustbuild: drop color handling) - #54350 (Support specifying edition in doc test) - #54370 (Improve handling of type bounds in `bit_set.rs`.) - #54371 (add -Zui-testing to rustdoc) - #54374 (Make 'proc_macro::MultiSpan' public.) - #54402 (Use no_default_libraries for all NetBSD flavors) - #54409 (Detect `for _ in in bar {}` typo) - #54412 (add applicability to span_suggestion call) - #54413 (Add UI test for deref recursion limit printing twice) - #54415 (parser: Tweak function parameter parsing to avoid rollback on succesfull path) - #54420 (Compress `Liveness` data some more.) - #54422 (Simplify slice's first(_mut) and last(_mut) with get) - #54446 (Unify christianpoveda's emails) Failed merges: - #54058 (Introduce the partition_dedup/by/by_key methods for slices) r? @ghost
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Since rollback is not perfect and may e.g. leave non-fatal errors after it, we need to make sure compilation fails if it happens.
So in particular case of
fn parse_arg_generalwe need to parse the "good"TYPEfirst and only then rollback and recover erroneousPAT: TYPEif necessary.Found when working on rust-lang/rfcs#2544 (comment).
r? @ghost