// module that would resolve any remaining missing package.
//
// If the main module is “tidy” (that is, if "go mod tidy" is a no-op for it)
// and all requested packages are in "all", then loading completes in a single
// iteration.
// TODO(bcmills): We should also be able to load in a single iteration if the
// requested packages all come from modules that are themselves tidy, regardless
// of whether those packages are in "all". Today, that requires two iterations

					roots = append(roots, m)
					pathIsRoot[m.Path] = true
				}
			}
		}

		if len(roots) > len(tidy.rootModules) {
			gover.ModSort(roots)
			tidy = newRequirements(pruned, roots, tidy.direct)
		}
	}

	roots = tidy.rootModules
	_, err := tidy.Graph(ctx)
	if err != nil {
		return nil, err
	}

	// We try to avoid adding explicit requirements for test-only dependencies of

		return fmt.Sprintf("updates to go.mod needed, disabled by -mod=%v; to update it:\n\tgo mod tidy", cfg.BuildMod)
	}
	if cfg.BuildModReason != "" {
		return fmt.Sprintf("updates to go.mod needed, disabled by -mod=%s\n\t(%s)\n\tto update it:\n\tgo mod tidy", cfg.BuildMod, cfg.BuildModReason)
	}
	return "updates to go.mod needed; to update it:\n\tgo mod tidy"
}

var errGoModDirty error = goModDirtyError{}

	if err != nil {
		return
	}
	if c.id1 != (cache.ActionID{}) {
		if cache.DebugTest {
			fmt.Fprintf(os.Stderr, "testcache: %s: save test ID %x => input ID %x => %x\n", a.Package.ImportPath, c.id1, testInputsID, testAndInputKey(c.id1, testInputsID))
		}
		cache.PutNoVerify(cache.Default(), c.id1, bytes.NewReader(testlog))
		cache.PutNoVerify(cache.Default(), testAndInputKey(c.id1, testInputsID), bytes.NewReader(a.TestOutput.Bytes()))

	if err := validateCtx(curCtx, event.UserGoReqs); err != nil {
		return curCtx, false, err
	}
	tid := TaskID(ev.args[0])
	nameID := stringID(ev.args[1])
	name, ok := evt.strings.get(nameID)
	if !ok {
		return curCtx, false, fmt.Errorf("invalid string ID %v for %v event", nameID, ev.typ)
	}

//sys	isWellKnownSid(sid *SID, sidType WELL_KNOWN_SID_TYPE) (isWellKnown bool) = advapi32.IsWellKnownSid
//sys	FreeSid(sid *SID) (err error) [failretval!=0] = advapi32.FreeSid
//sys	EqualSid(sid1 *SID, sid2 *SID) (isEqual bool) = advapi32.EqualSid
//sys	getSidIdentifierAuthority(sid *SID) (authority *SidIdentifierAuthority) = advapi32.GetSidIdentifierAuthority

				fmt.Fprintf(os.Stderr, "\tnote: expanded dependencies to upgrade to go %s or higher; run 'go mod tidy' to clean up\n", gover.ExplicitIndirectVersion)
			}

		} else {
			fmt.Fprintf(os.Stderr, "go: downgraded %s %s => %s\n", c.path, c.old, c.new)
		}
	}