}

  /**
   * Implementation of a transforming random access list. We try to make as many of these methods
   * pass-through to the source list as possible so that the performance characteristics of the
   * source list and transformed list are similar.
   *
   * @see Lists#transform
   */
  private static class TransformingRandomAccessList<

	i = ((i << 1) & 0xa) | ((i >> 1) & 0x5)
	return i
}

// gcmAdd adds two elements of GF(2¹²⁸) and returns the sum.
func gcmAdd(x, y *gcmFieldElement) gcmFieldElement {
	// Addition in a characteristic 2 field is just XOR.
	return gcmFieldElement{x.low ^ y.low, x.high ^ y.high}
}

// gcmDouble returns the result of doubling an element of GF(2¹²⁸).
func gcmDouble(x *gcmFieldElement) (double gcmFieldElement) {

func TestFuncProperties(t *testing.T) {
	td := t.TempDir()
	// td = "/tmp/qqq"
	// os.RemoveAll(td)
	// os.Mkdir(td, 0777)
	testenv.MustHaveGoBuild(t)

	// NOTE: this testpoint has the unfortunate characteristic that it
	// relies on the installed compiler, meaning that if you make
	// changes to the inline heuristics code in your working copy and
	// then run the test, it will test the installed compiler and not

[.screenshot]
image::build-cache/overlapping-outputs-timeline.png[]

== Reuse of outputs between different tasks

Some builds exhibit a surprising characteristic: even when executed against an empty cache, they produce tasks loaded from cache. How is this possible? Rest assured that this is completely normal.

     *
     * The transformer is used to generate the value to use to compare the entries by. That is, the entries are not compared by equals by an attribute or characteristic.
     *
     * The transformer is expected to produce a unique value for each entry in a single set. Behaviour is undefined if this condition is not met.
     *

     *
     * The transformer is used to generate the value to use to compare the entries by. That is, the entries are not compared by equals by an attribute or characteristic.
     *
     * The transformer is expected to produce a unique value for each entry in a single set. Behaviour is undefined if this condition is not met.
     *