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better error message for the object case switch transition period

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Araq 2019-05-27 22:46:52 +02:00
commit 781108ffe4
1 changed files with 4 additions and 1 deletions
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5
lib/system/assign.nim
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@ -237,4 +237,7 @@ proc FieldDiscriminantCheck(oldDiscVal, newDiscVal: int,
sysFatal(FieldError, "assignment to discriminant changes object branch") sysFatal(FieldError, "assignment to discriminant changes object branch")
else: else:
if newBranch != oldBranch: if newBranch != oldBranch:
sysFatal(FieldError, "assignment to discriminant changes object branch") if oldDiscVal != 0:
sysFatal(FieldError, "assignment to discriminant changes object branch")
else:
sysFatal(FieldError, "assignment to discriminant changes object branch; compile with -d:nimOldCaseObjects for a transition period")