type simpleWriter struct { // hide bytes.Buffer's WriteString
		Writer
	}
	mw := MultiWriter(simpleWriter{&sink1}, simpleWriter{&sink2})
	allocs := int(testing.AllocsPerRun(1000, func() {
		WriteString(mw, "foo")
	}))
	if allocs != 1 {
		t.Errorf("num allocations = %d; want 1", allocs)
	}
}

type writeStringChecker struct{ called bool }

func (c *writeStringChecker) WriteString(s string) (n int, err error) {

		s := utilrand.String(size)
		f := func() {
			b := toBytes(s)
			if len(b) != size {
				t.Errorf("invalid length: %d", len(b))
			}
		}
		allocs := testing.AllocsPerRun(100, f)
		if allocs > 0 {
			t.Errorf("expected zero allocations, got %v", allocs)
		}
	})

	t.Run("toString semantics", func(t *testing.T) {
		t.Parallel()

		b := make([]byte, size)
		if _, err := rand.Read(b); err != nil {

        int result = BigIntegerMath.log2(x, mode);
        assertTrue(ZERO.setBit(result).compareTo(x) >= 0);
        assertTrue(result == 0 || ZERO.setBit(result - 1).compareTo(x) < 0);
      }
    }
  }

  // Relies on the correctness of isPowerOfTwo(BigInteger).
  public void testLog2Exact() {
    for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
      // We only expect an exception if x was not a power of 2.

	// Alternate between whether the chunk will be held live or will be
	// condemned to GC to create holes in the heap.
	saved := make([][]byte, allocs/2+1)
	condemned := make([][]byte, allocs/2)
	for i := 0; i < allocs; i++ {
		b := make([]byte, allocChunk)
		if i%2 == 0 {
			saved = append(saved, b)
		} else {
			condemned = append(condemned, b)
		}
	}

			t.Errorf("%s: got line = %d; want %d", test.src, line, test.line)
		}
		if col := pos.RelCol(); col != test.col {
			t.Errorf("%s: got col = %d; want %d", test.src, col, test.col)
		}
	}
}

// Test that typical uses of UnpackListExpr don't allocate.
func TestUnpackListExprAllocs(t *testing.T) {
	var x Expr = NewName(Pos{}, "x")
	allocs := testing.AllocsPerRun(1000, func() {
		list := UnpackListExpr(x)

        try {
          LongMath.log2(x, mode);
          fail("Expected IllegalArgumentException");
        } catch (IllegalArgumentException expected) {
        }
      }
    }
  }

  /* Relies on the correctness of BigIntegerMath.log2 for all modes except UNNECESSARY. */
  public void testLog2MatchesBigInteger() {
    for (long x : POSITIVE_LONG_CANDIDATES) {
      for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {

   * is.
   *
   * <p>It is recommended that the funnel be implemented as a Java enum. This has the benefit of
   * ensuring proper serialization and deserialization, which is important since {@link #equals}
   * also relies on object identity of funnels.
   *
   * @param funnel the funnel of T's that the constructed {@code BloomFilter} will use
   * @param expectedInsertions the number of expected insertions to the constructed {@code

	}
	p0.TimeNanos = ts
	return p0, nil
}

var profileSupportsDelta = map[handler]bool{
	"allocs":       true,
	"block":        true,
	"goroutine":    true,
	"heap":         true,
	"mutex":        true,
	"threadcreate": true,
}

var profileDescriptions = map[string]string{
	"allocs":       "A sampling of all past memory allocations",

	}
	testenv.SkipIfOptimizationOff(t)

	if allocs := testing.AllocsPerRun(100, func() {
		seed := make([]byte, SeedSize)
		message := []byte("Hello, world!")
		priv := NewKeyFromSeed(seed)
		pub := priv.Public().(PublicKey)
		signature := Sign(priv, message)
		if !Verify(pub, message, signature) {
			t.Fatal("signature didn't verify")
		}
	}); allocs > 0 {
		t.Errorf("expected zero allocations, got %0.1f", allocs)

func TestAppendAllocs(t *testing.T) {
	buf := make([]byte, 0, Size(&s))
	var err error
	allocs := testing.AllocsPerRun(1, func() {
		_, err = Append(buf, LittleEndian, &s)
	})
	if err != nil {
		t.Fatal("Append failed:", err)
	}
	if allocs != 0 {
		t.Fatalf("Append allocated %v times instead of not allocating at all", allocs)
	}
}

var sizableTypes = []any{
	bool(false),
	int8(0),
	int16(0),