return nil, nil, err
	}
	seen := map[string]bool{}
	for _, d := range wf.Use {
		modRoot := d.Path
		if !filepath.IsAbs(modRoot) {
			modRoot = filepath.Join(workDir, modRoot)
		}

		if seen[modRoot] {
			return nil, nil, fmt.Errorf("error loading go.work:\n%s:%d: path %s appears multiple times in workspace", base.ShortPath(path), d.Syntax.Start.Line, modRoot)
		}
		seen[modRoot] = true

	}
	return tp
}

// objBase returns the base pointer for the object containing addr in span.
//
// Assumes that addr points into a valid part of span (span.base() <= addr < span.limit).
//
//go:nosplit
func (span *mspan) objBase(addr uintptr) uintptr {
	return span.base() + span.objIndex(addr)*span.elemsize
}

// bulkBarrierPreWrite executes a write barrier

	if span.list != list {
		print("runtime: failed mSpanList.remove span.npages=", span.npages,
			" span=", span, " prev=", span.prev, " span.list=", span.list, " list=", list, "\n")
		throw("mSpanList.remove")
	}
	if list.first == span {
		list.first = span.next
	} else {
		span.prev.next = span.next
	}
	if list.last == span {
		list.last = span.prev
	} else {
		span.next.prev = span.prev

		// Validate the named M.
		if mid == curCtx.M {
			if gen != o.initialGen && curCtx.G != gid {
				// If this isn't the first generation, we *must* have seen this
				// binding occur already. Even if the G was blocked in a syscall
				// for multiple generations since trace start, we would have seen
				// a previous GoStatus event that bound the goroutine to an M.

	// contain defers (d3 in this case) for dead frames. The inversion here
	// always indicates a dead frame, and the effect of the inversion on the
	// scan is to hide those dead frames, so the scan is still okay:
	// what's left on the panic stack are exactly (and only) the dead frames.
	//
	// We require callback != nil here because only when callback != nil

    /**
     * <p>Sets the build directory of this project. The build directory is the directory which all artifacts are
     * generated into. The path parameter is evaluated as described for {@link #file(Object)}. This mean you can use,
     * amongst other things, a relative or absolute path or File object to specify the build directory.</p>
     *
     * @param path The build directory. This is evaluated as per {@link #file(Object)}

				m := module.Version{Path: p, Version: mg.g.Selected(p)}
				if !seen[m] {
					needsEnqueueing[m] = true
					continue
				}
				reqs, _ := mg.g.RequiredBy(m)
				for _, r := range reqs {
					s := module.Version{Path: r.Path, Version: mg.g.Selected(r.Path)}
					if gover.ModCompare(r.Path, s.Version, r.Version) > 0 && !seen[s] {
						needsEnqueueing[s] = true
					}
				}
			}

			snapshot := *v
			req.GetBody = func() (io.ReadCloser, error) {
				r := snapshot
				return io.NopCloser(&r), nil
			}
		default:
			// This is where we'd set it to -1 (at least
			// if body != NoBody) to mean unknown, but
			// that broke people during the Go 1.8 testing
			// period. People depend on it being 0 I
			// guess. Maybe retry later. See Issue 18117.
		}
		// For client requests, Request.ContentLength of 0

//     cannot be promoted due to -mod=readonly or -mod=vendor, the importing
//     package is marked with an error.
//
//   - If ld scanned the "all" pattern independent of build constraints, it is
//     guaranteed to have seen every direct import. Module dependencies that did
//     not provide any directly-imported package are then marked as indirect.
//
//   - Root dependencies are updated to their selected versions.
//

		t.Errorf("response X-Modified header = %q; want %q", got, want)
	}

	io.WriteString(rwc, "Hello\n")
	bs := bufio.NewScanner(rwc)
	if !bs.Scan() {
		t.Fatalf("Scan: %v", bs.Err())
	}
	got = bs.Text()
	want = `backend got "Hello"`
	if got != want {
		t.Errorf("got %#q, want %#q", got, want)
	}
}