private void findConversionOrFail(PsiExpression expression, PsiExpression toFail, Pair<PsiType, PsiType> typePair) {
    final TypeConversionDescriptorBase conversion = myLabeler.getRules().findConversion(typePair.getFirst(), typePair.getSecond(), null, expression, myLabeler);
    if (conversion == null) {
      myLabeler.markFailedConversion(typePair.getSecond(), toFail);
    }
    else {
      myLabeler.setConversionMapping(expression, conversion);
      final PsiType psiType = myTypeEvaluator.evaluateType(expression);
      LOG.assertTrue(psiType != null,  expression);
      myTypeEvaluator.setType(new TypeMigrationUsageInfo(expression), psiType);
    }
  }
private void findConversionOrFail(PsiExpression expression, PsiExpression toFail, Pair<PsiType, PsiType> typePair)