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fix issue #3550

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trustable-code 2015-12-24 00:07:03 +01:00
commit 3c557a0144
2 changed files with 20 additions and 4 deletions
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5
compiler/cgmeth.nim
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@ -19,10 +19,7 @@ proc genConv(n: PNode, d: PType, downcast: bool): PNode =
if (source.kind == tyObject) and (dest.kind == tyObject): if (source.kind == tyObject) and (dest.kind == tyObject):
var diff = inheritanceDiff(dest, source) var diff = inheritanceDiff(dest, source)
if diff == high(int): if diff == high(int):
# see bug #3550 which triggers it. XXX This is a hack but I don't know yet # no subtype relation, nothing to do
# how the real fix looks like:
localError(n.info, "there is no subtype relation between " &
typeToString(d) & " and " & typeToString(n.typ))
result = n result = n
elif diff < 0: elif diff < 0:
result = newNodeIT(nkObjUpConv, n.info, d) result = newNodeIT(nkObjUpConv, n.info, d)

19
tests/method/tmultim8.nim Normal file
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@ -0,0 +1,19 @@
# bug #3550
type
BaseClass = ref object of RootObj
Class1 = ref object of BaseClass
Class2 = ref object of BaseClass
method test(obj: Class1, obj2: BaseClass) =
discard
method test(obj: Class2, obj2: BaseClass) =
discard
var obj1 = Class1()
var obj2 = Class2()
obj1.test(obj2)
obj2.test(obj1)