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Rollup merge of rust-lang#32494 - pnkfelix:gate-parser-recovery-via-d…
…ebugflag, r=nrc Gate parser recovery via debugflag Gate parser recovery via debugflag Put in `-Z continue_parse_after_error` This works by adding a method, `fn abort_if_no_parse_recovery`, to the diagnostic handler in `syntax::errors`, and calling it after each error is emitted in the parser. (We might consider adding a debugflag to do such aborts in other places where we are currently attempting recovery, such as resolve, but I think the parser is the really important case to handle in the face of rust-lang#31994 and the parser bugs of varying degrees that were injected by parse error recovery.) r? @nikomatsakis
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