printAncestorTraceback(ancestor)
	}
}

// traceback2 prints a stack trace starting at u. It skips the first "skip"
// logical frames, after which it prints at most "max" logical frames. It
// returns n, which is the number of logical frames skipped and printed, and
// lastN, which is the number of logical frames skipped or printed just in the
// physical frame that u references.

(Neg(64|32|16|8) ...) => (NEG ...)
(Neg(64|32)F ...) => (FNEG ...)

(Com(64|32|16|8) x) => (NOR x x)

// Lowering boolean ops
(AndB ...) => (AND ...)
(OrB ...) => (OR ...)
(Not x) => (XORconst [1] x)

// Merge logical operations
(AND x (NOR y y)) => (ANDN x y)
(OR x (NOR y y)) => (ORN x y)

// Lowering comparisons
(EqB x y)  => (ANDconst [1] (EQV x y))

			// we can stop searching when we leave the block.
			continue
		}
		if v.Op == OpPhi {
			// A Phi implies we have reached the top of the block.
			// The memory phi, if it exists, is always
			// the first logical store in the block.
			continue
		}
		if v.Type.IsTuple() && v.Type.FieldType(1).IsMemory() {
			// We could handle this situation however it is likely
			// to be very rare.
			return false
		}

    if (strided_slice_op.getEllipsisMask() != 0) {
      // Ellipsis mask should have been lowered-away prior to invoking this
      // function.
      op->emitError() << "encountered a logical error";
      return failure();
    }

    // Insert a new reshape op.
    Value original_input = strided_slice_op.getInput();
    RankedTensorType original_input_type =

  }

  @Override
  public ImmutableSortedSet<K> descendingKeySet() {
    return keySet.descendingSet();
  }

  /**
   * Serialized type for all ImmutableSortedMap instances. It captures the logical contents and they
   * are reconstructed using public factory methods. This ensures that the implementation types
   * remain as implementation details.
   */
  @J2ktIncompatible // serialization

	// size of bucket hash table
	buckHashSize = 179999

	// maxSkip is to account for deferred inline expansion
	// when using frame pointer unwinding. We record the stack
	// with "physical" frame pointers but handle skipping "logical"
	// frames at some point after collecting the stack. So
	// we need extra space in order to avoid getting fewer than the
	// desired maximum number of frames after expansion.

See <<#project_builddir, the deprecation entry>> for details.

==== `TestLauncher` API no longer ignores build failures

The `TestLauncher` interface is part of the Tooling API, specialized for running tests.
It is a logical extension of the `BuildLauncher` that can only launch tasks.
A discrepancy has been reported in their behavior: if the same failing test is executed, `BuildLauncher` will report a build failure but `TestLauncher` won't.