Loosen these checks if we imported a third party c extension

src/runtime/objmodel.cpp

@@ -43,6 +43,7 @@
 #include "runtime/generator.h"
 #include "runtime/hiddenclass.h"
 #include "runtime/ics.h"
+#include "runtime/import.h"
 #include "runtime/iterobject.h"
 #include "runtime/long.h"
 #include "runtime/rewrite_args.h"
@@ -4964,7 +4965,7 @@ Box* callCLFunc(FunctionMetadata* md, CallRewriteArgs* rewrite_args, int num_out
 
     // We check for this assertion later too - by checking it twice, we know
     // if the error state was set before calling the chosen CF or after.
-    ASSERT(!PyErr_Occurred(), "");
+    ASSERT(imported_foreign_cextension || !PyErr_Occurred(), "");
 
     Box* r;
     // we duplicate the call to callChosenCf here so we can
@@ -4989,7 +4990,7 @@ Box* callCLFunc(FunctionMetadata* md, CallRewriteArgs* rewrite_args, int num_out
         ASSERT(chosen_cf->spec->rtn_type->isFitBy(r->cls), "%s (%p) was supposed to return %s, but gave a %s",
                g.func_addr_registry.getFuncNameAtAddress(chosen_cf->code, true, NULL).c_str(), chosen_cf->code,
                chosen_cf->spec->rtn_type->debugName().c_str(), r->cls->tp_name);
-        ASSERT(!PyErr_Occurred(), "%p", chosen_cf->code);
+        ASSERT(imported_foreign_cextension || !PyErr_Occurred(), "%p", chosen_cf->code);
     }
 
     return r;