mobius-rx2/src/main/java/com/spotify/mobius/rx2/RxMobius.java [464:480]:
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                throw new RuntimeException(
                    "FATAL: fatal error handler threw exception for effect handler: "
                        + effectHandler,
                    e);
              }
            }
          };

      return this;
    }

    public ObservableTransformer<F, E> build() {
      return new MobiusEffectRouter<>(effectPerformerMap.keySet(), effectPerformerMap.values());
    }

    private static <F, E> Consumer<Throwable> defaultOnError(
        final ObservableTransformer<? extends F, E> effectHandler) {
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mobius-rx3/src/main/java/com/spotify/mobius/rx3/RxMobius.java [328:344]:
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                throw new RuntimeException(
                    "FATAL: fatal error handler threw exception for effect handler: "
                        + effectHandler,
                    e);
              }
            }
          };

      return this;
    }

    public ObservableTransformer<F, E> build() {
      return new MobiusEffectRouter<>(effectPerformerMap.keySet(), effectPerformerMap.values());
    }

    private static <F, E> Consumer<Throwable> defaultOnError(
        final ObservableTransformer<? extends F, E> effectHandler) {
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