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-rw-r--r--lib/pure/unittest.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/pure/unittest.nim b/lib/pure/unittest.nim
index ab45f78dc..18b09e4c0 100644
--- a/lib/pure/unittest.nim
+++ b/lib/pure/unittest.nim
@@ -669,7 +669,8 @@ macro check*(conditions: untyped): untyped =
           let paramAst = exp[i]
           if exp[i].kind == nnkIdent:
             result.printOuts.add getAst(print(argStr, paramAst))
-          if exp[i].kind in nnkCallKinds + {nnkDotExpr, nnkBracketExpr, nnkPar}:
+          if exp[i].kind in nnkCallKinds + {nnkDotExpr, nnkBracketExpr, nnkPar} and
+                  (exp[i].typeKind notin {ntyTypeDesc} or $exp[0] notin ["is", "isnot"]):
             let callVar = newIdentNode(":c" & $counter)
             result.assigns.add getAst(asgn(callVar, paramAst))
             result.check[i] = callVar