assertEquals("%s", Strings.lenientFormat("%s"));
    assertEquals("5", Strings.lenientFormat("%s", 5));
    assertEquals("foo [5]", Strings.lenientFormat("foo", 5));
    assertEquals("foo [5, 6, 7]", Strings.lenientFormat("foo", 5, 6, 7));
    assertEquals("%s 1 2", Strings.lenientFormat("%s %s %s", "%s", 1, 2));
    assertEquals(" [5, 6]", Strings.lenientFormat("", 5, 6));

  private static String badElementIndex(int index, int size, String desc) {
    if (index < 0) {
      return lenientFormat("%s (%s) must not be negative", desc, index);
    } else if (size < 0) {
      throw new IllegalArgumentException("negative size: " + size);
    } else { // index >= size
      return lenientFormat("%s (%s) must be less than size (%s)", desc, index, size);
    }
  }

  /**

  }

  static boolean patternCompilerIsPcreLike() {
    throw new UnsupportedOperationException();
  }

  static String lenientFormat(@Nullable String template, @Nullable Object @Nullable ... args) {
    return Strings.lenientFormat(template, args);
  }

  static String stringValueOf(@Nullable Object o) {
    return String.valueOf(o);
  }

  private Platform() {}

   */
  static @Nullable String emptyToNull(@Nullable String string) {
    return stringIsNullOrEmpty(string) ? null : string;
  }

  static String lenientFormat(@Nullable String template, @Nullable Object @Nullable ... args) {
    return Strings.lenientFormat(template, args);
  }

  static String stringValueOf(@Nullable Object o) {
    return String.valueOf(o);
  }

   *     non-null values are converted to strings using {@link Object#toString()}.
   * @since 25.1
   */
  // TODO(diamondm) consider using Arrays.toString() for array parameters
  public static String lenientFormat(
      @Nullable String template, @Nullable Object @Nullable ... args) {
    template = String.valueOf(template); // null -> "null"

    if (args == null) {
      args = new Object[] {"(Object[])null"};
    }

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;
import static com.google.common.base.Strings.lenientFormat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Converter;

    } else if (params.length == 2) {
      assertThat(throwable).hasMessageThat().isEmpty();
    } else {
      assertThat(throwable)
          .hasMessageThat()
          .isEqualTo(Strings.lenientFormat("", Arrays.copyOfRange(params, 2, params.length)));
    }
  }

  /**
   * Returns an array containing parameters for invoking a checkArgument, checkNotNull or checkState
   * method reflectively
   *

    } else if (params.length == 2) {
      assertThat(throwable).hasMessageThat().isEmpty();
    } else {
      assertThat(throwable)
          .hasMessageThat()
          .isEqualTo(Strings.lenientFormat("", Arrays.copyOfRange(params, 2, params.length)));
    }
  }

  /**
   * Returns an array containing parameters for invoking a checkArgument, checkNotNull or checkState
   * method reflectively
   *

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;
import static com.google.common.base.Strings.lenientFormat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Converter;

          Set<String> immutableCopy;
          try {
            immutableCopy = copyOf(input);
          } catch (RuntimeException e) {
            throw new RuntimeException(
                Strings.lenientFormat(
                    "byAscendingSize %s, startIndex %s, inputIsSet %s",
                    byAscendingSize, startIndex, inputIsSet),
                e);
          }
          /*