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test disabling generic matches to empty containers except @[] #24397

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test disabling generic matches to empty containers except @[] #24397

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2 changes: 2 additions & 0 deletions compiler/sigmatch.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -2538,6 +2538,8 @@ proc paramTypesMatchAux(m: var TCandidate, f, a: PType,
(arg.typ.isIntLit and not m.isNoCall):
result = arg.copyTree
result.typ() = getInstantiatedType(c, arg, m, f).skipTypes({tySink})
if result.typ.isEmptyContainer and m.magic != mArrToSeq:
result = nil
else:
result = arg
of isBothMetaConvertible:
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2 changes: 2 additions & 0 deletions tests/errmsgs/temptyset1.nim
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@@ -0,0 +1,2 @@
assert card({}) == 0 #[tt.Error
^ type mismatch: got <set[empty]>]#
2 changes: 2 additions & 0 deletions tests/errmsgs/temptyset2.nim
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@@ -0,0 +1,2 @@
assert {} <= {} #[tt.Error
^ type mismatch: got <set[empty], set[empty]>]#
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