code: @Pure
  	@Inline(value="$3.$4of($1, $2)", imported=Pair.class)
  	public static <A, B> Pair<A, B> operator_mappedTo(A a, B b) {
  		return Pair.of(a, b);
  	}
docs: The <code>mappedTo</code> operator yields a {@link Pair} with {@code a} as the {@link Pair#getKey() key} and
  {@code b} as its {@link Pair#getValue() value}.
  
  @param a
  an object.
  @param b
  another object.
  @return a {@link Pair}. Never <code>null</code>.