func blockMutex(t *testing.T) {
	var mu sync.Mutex
	mu.Lock()
	go func() {
		awaitBlockedGoroutine(t, "sync.Mutex.Lock", "blockMutex", 1)
		mu.Unlock()
	}()
	// Note: Unlock releases mu before recording the mutex event,
	// so it's theoretically possible for this to proceed and
	// capture the profile before the event is recorded. As long
	// as this is blocked before the unlock happens, it's okay.
	mu.Lock()
}

   * across different segments.
   *
   * The page replacement algorithm's data structures are kept casually consistent with the map. The
   * ordering of writes to a segment is sequentially consistent. An update to the map and recording
   * of reads may not be immediately reflected on the algorithm's data structures. These structures
   * are guarded by a lock and operations are applied in batches to avoid lock contention. The

  }

  /**
   * Enable the accumulation of {@link CacheStats} during the operation of the cache. Without this
   * {@link Cache#stats} will return zero for all statistics. Note that recording stats requires
   * bookkeeping to be performed with each operation, and thus imposes a performance penalty on
   * cache operation.
   *
   * @return this {@code CacheBuilder} instance (for chaining)

    TF_RETURN_IF_ERROR(vspace_.CallBackwardFunction(
        op_type, backward_function.get(), unneeded_gradients, forwardprop_aids,
        absl::MakeSpan(grad)));
  }

  // Stop the tape from recording
  pop_backward_tape.release()();

  std::vector<int64_t> targets;
  std::vector<Gradient*> used_in_grads;
  // We may end up with slightly fewer elements than we reserve, but grad.size()

  }

  /**
   * Enable the accumulation of {@link CacheStats} during the operation of the cache. Without this
   * {@link Cache#stats} will return zero for all statistics. Note that recording stats requires
   * bookkeeping to be performed with each operation, and thus imposes a performance penalty on
   * cache operation.
   *
   * @return this {@code CacheBuilder} instance (for chaining)

	FakeP    = 1000000 + iota
	TimerP   // contains timer unblocks
	NetpollP // contains network unblocks
	SyscallP // contains returns from syscalls
	GCP      // contains GC state
	ProfileP // contains recording of CPU profile samples
)

// Trace is the result of Parse.
type Trace struct {
	Version version.Version

	// Events is the sorted list of Events in the trace.
	Events Events

(e.g.: []T{{...}, {...}}, the hint is the type T in this case).

All expressions are checked via rawExpr, which dispatches according
to expression kind. Upon returning, rawExpr is recording the types and
constant values for all expressions that have an untyped type (those types
may change on the way up in the expression tree). Usually these are constants,

   * exceeded.
   *
   * The page replacement algorithm's data structures are kept casually consistent with the map. The
   * ordering of writes to a segment is sequentially consistent. An update to the map and recording
   * of reads may not be immediately reflected on the algorithm's data structures. These structures
   * are guarded by a lock and operations are applied in batches to avoid lock contention. The

   * exceeded.
   *
   * The page replacement algorithm's data structures are kept casually consistent with the map. The
   * ordering of writes to a segment is sequentially consistent. An update to the map and recording
   * of reads may not be immediately reflected on the algorithm's data structures. These structures
   * are guarded by a lock and operations are applied in batches to avoid lock contention. The

(e.g.: []T{{...}, {...}}, the hint is the type T in this case).

All expressions are checked via rawExpr, which dispatches according
to expression kind. Upon returning, rawExpr is recording the types and
constant values for all expressions that have an untyped type (those types
may change on the way up in the expression tree). Usually these are constants,