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more robust for nim check

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Araq
2014-09-17 23:13:38 +02:00
parent 1ce17c7aaa
commit 02c076f9b4
1 changed files with 1 additions and 0 deletions
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compiler/types.nim
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@@ -969,6 +969,7 @@ proc inheritanceDiff*(a, b: PType): int =
# | returns: -x iff `a` is the x'th direct superclass of `b`
# | returns: +x iff `a` is the x'th direct subclass of `b`
# | returns: `maxint` iff `a` and `b` are not compatible at all
if a == b or a.kind == tyError or b.kind == tyError: return 0
assert a.kind == tyObject
assert b.kind == tyObject
var x = a