success = true;
      throw e;
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      throw new ExecutionException(e);
    } catch (RuntimeException e) {
      throw new UncheckedExecutionException(e);
    } catch (Exception e) {
      throw new ExecutionException(e);
    } catch (Error e) {
      throw new ExecutionError(e);
    } finally {

	if iscgo {
		if _cgo_pthread_key_created == nil {
			throw("_cgo_pthread_key_created missing")
		}

		if _cgo_thread_start == nil {
			throw("_cgo_thread_start missing")
		}
		if GOOS != "windows" {
			if _cgo_setenv == nil {
				throw("_cgo_setenv missing")
			}
			if _cgo_unsetenv == nil {
				throw("_cgo_unsetenv missing")
			}
		}
		if _cgo_notify_runtime_init_done == nil {

            return delegate;
          }

          @Override
          public String get() {
            throw new RuntimeException();
          }

          @Override
          public String get(long timeout, TimeUnit unit) {
            throw new RuntimeException();
          }
        };

    final SettableFuture<String> delayedSuccess = SettableFuture.create();

            return delegate;
          }

          @Override
          public String get() {
            throw new RuntimeException();
          }

          @Override
          public String get(long timeout, TimeUnit unit) {
            throw new RuntimeException();
          }
        };

    final SettableFuture<String> delayedSuccess = SettableFuture.create();

      success = true;
      throw e;
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      throw new ExecutionException(e);
    } catch (RuntimeException e) {
      throw new UncheckedExecutionException(e);
    } catch (Exception e) {
      throw new ExecutionException(e);
    } catch (Error e) {
      throw new ExecutionError(e);
    } finally {

      throw new UnsupportedOperationException();
    }

    @Override
    public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
      throw new UnsupportedOperationException();
    }

    @Override
    @CheckForNull
    public V putIfAbsent(K key, V value) {
      throw new UnsupportedOperationException();
    }

        return set;
      }

      @Override
      public boolean add(@ParametricNullness E element) {
        throw new UnsupportedOperationException();
      }

      @Override
      public boolean addAll(Collection<? extends E> es) {
        throw new UnsupportedOperationException();
      }
    };
  }

                formatter.append(" is private.");
                throw new ClassGenerationException(formatter.toString());
            }
            if (Modifier.isFinal(modifiers)) {
                TreeFormatter formatter = new TreeFormatter();
                formatter.node(type);
                formatter.append(" is final.");
                throw new ClassGenerationException(formatter.toString());
            }

          },
          directExecutor());
    } else {
      switch (state.get()) {
        case SUBSUMED:
          throw new IllegalStateException(
              "Cannot call finishToFuture() after deriving another step");

        case WILL_CREATE_VALUE_AND_CLOSER:
          throw new IllegalStateException(
              "Cannot call finishToFuture() after calling finishToValueAndCloser()");

    }

    void isTransformed(String from, String to) {
        def dirs = allOutputDirs(from, to)
        if (dirs.size() == 0) {
            throw new AssertionError("Could not find $from -> $to in output: $output")
        }
        if (dirs.size() > 1) {
            throw new AssertionError("Found $from -> $to more than once in output: $output")
        }
        assert output.count("into " + dirs.first()) == 1
    }