Trace.from constructor

Trace.from(StackTrace trace)

Returns a new stack trace containing the same data as trace.

If trace is a native StackTrace, its data will be parsed out; if it's a Trace, it will be returned as-is.

Implementation 

factory Trace.from(StackTrace trace) {
  // Normally explicitly validating null arguments is bad Dart style, but here
  // the natural failure will only occur when the LazyTrace is materialized,
  // and we want to provide an error that's more local to the actual problem.
  if (trace == null) {
    throw new ArgumentError("Cannot create a Trace from null.");
  }

  if (trace is Trace) return trace;
  if (trace is Chain) return trace.toTrace();
  return new LazyTrace(() => new Trace.parse(trace.toString()));
}