if (method.isAnnotationPresent(Generates.class)) {
        builder.put(method.getReturnType(), method);
      }
    }
    GENERATORS = builder.buildOrThrow();
  }

  private static final ImmutableMap<Class<?>, Method> EMPTY_GENERATORS;

  static {
    ImmutableMap.Builder<Class<?>, Method> builder = ImmutableMap.builder();

        }
        duplicates.put(effectiveEntry, true);
        dupCount++;
        // Make sure we are not overwriting the original entries array, in case we later do
        // buildOrThrow(). We would want an exception to include two values for the duplicate key.
        if (entries == entryArray) {
          // Temporary variable is necessary to defeat bad smartcast (entries adopting the type of

          .put("HmacSHA1", SHA1_KEY, Hashing.hmacSha1(SHA1_KEY))
          .put("HmacSHA256", SHA256_KEY, Hashing.hmacSha256(SHA256_KEY))
          .put("HmacSHA512", SHA512_KEY, Hashing.hmacSha512(SHA512_KEY))
          .buildOrThrow();

  public void testNulls() {
    NullPointerTester tester =
        new NullPointerTester().setDefault(String.class, "HmacMD5").setDefault(Key.class, MD5_KEY);

        Type type = mapping.getValue();
        checkArgument(!variable.equalsType(type), "Type variable %s bound to itself", variable);
        builder.put(variable, type);
      }
      return new TypeTable(builder.buildOrThrow());
    }

    final Type resolve(TypeVariable<?> var) {
      TypeTable unguarded = this;
      TypeTable guarded =
          new TypeTable() {
            @Override

        Type type = mapping.getValue();
        checkArgument(!variable.equalsType(type), "Type variable %s bound to itself", variable);
        builder.put(variable, type);
      }
      return new TypeTable(builder.buildOrThrow());
    }

    final Type resolve(TypeVariable<?> var) {
      TypeTable unguarded = this;
      TypeTable guarded =
          new TypeTable() {
            @Override