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    • Guillaume Melquiond's avatar
      Remove handcrafted error messages (fix issues #150 and #172). · ce21b6c1
      Guillaume Melquiond authored
      Short story: it was a source of bugs, there was only one handcrafted
      message over 650, and, to quote François Pottier, "you seem to have
      misunderstood what the various commands do".
      
      Long story: the proper steps to update the error messages after modifying
      the parser are
      
      1. update the old states with --update-errors
      2. generate the new states with --list-errors
      3. compare the old and new states with --compare-errors
      4. manually reconcile the differences between the old and new states
      5. write error messages for the new states
      6. add %on_error_reduce and go back to step 1, if step 5 is too hard
      7. check that the error messages for the old states are still meaningful
      8. check that the set of states is both correct (--compile-errors) and
         complete (--compare-errors)
      
      We were doing only step 1 and half of step 8. Doing the other half of
      step 8 would have prevented issue #172 from occurring. But that would have
      meant doing step 4 after each parser modification, which was never done.
      Note that step 2 is so expensive that it is impossible to perform step 8
      during continuous integration.
      
      Given the work needed to update the error messages after a syntax change,
      I don't think we can reliably use them until WhyML no longer evolves.
      ce21b6c1
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