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2156 :: Odd compiler error given for erroneous program

• bobg (orginal) [2016-03-25T13:00:49+01:00] view original

  I know it is difficult to provide 100% accurate compiler error messages, but consider the erroneous program below:

  
  var key: int = 1
  case key:
  of 0:
    echo($key)
  of 1:
    echo($key))
  else:
    echo($key)
  Run

  The output from the compiler is strange:

  
  Bobs-Air:dataquery bobgus$ nim c -r parensProblem.nim
  Hint: system [Processing]
  Hint: parensProblem [Processing]
  parensProblem.nim(2, 1) Error: not all cases are covered
  Run

  After seeing the error message, I looked at the case statement - looking for a missing integer. I think the 'else' covers all the rest of the cases and so the error message is misleading.

  After I accidentally found the double closing parentheses and corrected the program, it compiled fine.

  A double closing parenthesis can be a common keying problem - it should be possible to detect this case - no look-ahead is required as it is a closing parenthesis.

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• def (orginal) [2016-03-25T14:04:51+01:00] view original

  By the way, you can use echo key instead of echo($key)

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