Method checkKey

output/java_guava/1.4.17/AbstractBiMap.java:76–79

Returns its input, or throws an exception if this is not a valid key.

(@Nullable K key)

   */

  @CanIgnoreReturnValue
  K checkKey(@Nullable K key) {
    return key;
  }

  /**
   * Returns its input, or throws an exception if this is not a valid value.