t.Errorf("#%d: %q: expected error %q; got none", i, test.input, test.error)
			}
			continue
		}
		if !strings.Contains(err.Error(), test.error) {
			t.Errorf("#%d: expected error %q; got %q", i, test.error, err)
			continue
		}
	}
}

func runBadTest(i int, test badExprTest, t *testing.T) (err error) {
	p := NewParser(nil, nil, nil) // Expression evaluation uses none of these fields of the parser.

// m.Version, or version "none" if no prior version is tagged.
//
// Since the version of a main module is not found in the version list,
// it has no previous version.
func previousVersion(ctx context.Context, m module.Version) (module.Version, error) {
	if m.Version == "" && MainModules.Contains(m.Path) {
		return module.Version{Path: m.Path, Version: "none"}, nil
	}

	"cmd/go/internal/par"

	"golang.org/x/mod/module"
)

// A Reqs is the requirement graph on which Minimal Version Selection (MVS) operates.
//
// The version strings are opaque except for the special version "none"
// (see the documentation for module.Version). In particular, MVS does not
// assume that the version strings are semantic versions; instead, the Max method
// gives access to the comparison operation.
//

		parser := NewParser(ctxt, arch, tokenizer)

		err := tryParse(t, func() {
			parser.Parse()
		})

		switch {
		case err == nil:
			t.Errorf("#%d: %q: want error %q; have none", i, test.input, test.error)
		case !strings.Contains(err.Error(), test.error):
			t.Errorf("#%d: %q: want error %q; have %q", i, test.input, test.error, err)
		}
	}

	}

	if *editGo != "" && *editGo != "none" {
		if !modfile.GoVersionRE.MatchString(*editGo) {
			base.Fatalf(`go work: invalid -go option; expecting something like "-go %s"`, gover.Local())
		}
	}
	if *editToolchain != "" && *editToolchain != "none" {
		if !modfile.ToolchainRE.MatchString(*editToolchain) {

)

var DebugFlags struct {
	MayMoreStack string `help:"call named function before all stack growth checks"`
	PCTab        string `help:"print named pc-value table\nOne of: pctospadj, pctofile, pctoline, pctoinline, pctopcdata"`
}

var (
	D        MultiFlag
	I        MultiFlag
	PrintOut int
	DebugV   bool
)

func init() {

}

// A TypeAndValue records the type information, constant
// value if known, and various other flags associated with
// an expression.
// This type is similar to types2.TypeAndValue, but exposes
// none of types2's internals.
type TypeAndValue struct {
	Type  Type
	Value constant.Value
	exprFlags
}

type exprFlags uint16

func (f exprFlags) IsVoid() bool          { return f&1 != 0 }

		qm.mayUseLatest = true

	case query == "upgrade":
		if current == "" || current == "none" {
			qm.mayUseLatest = true
		} else {
			qm.mayUseLatest = module.IsPseudoVersion(current)
			qm.filter = func(mv string) bool { return gover.ModCompare(qm.path, mv, current) >= 0 }
		}

	case query == "patch":
		if current == "" || current == "none" {
			return nil, &NoPatchBaseError{path}
		}
		if current == "" {

	patternAllQueries []*query // queries with the pattern "all"

	// Indexed "none" queries. These are also included in the slices above;
	// they are indexed here to speed up noneForPath.
	nonesByPath   map[string]*query // path-literal "@none" queries indexed by path
	wildcardNones []*query          // wildcard "@none" queries

	// resolvedVersion maps each module path to the version of that module that

			// which will pull in its dependencies. Ensure that its dependencies are
			// included in the module graph.
			v := mg.g.Selected(p)
			if v == "none" {
				// Version “none” always has no requirements, so it doesn't need
				// an explicit node in the module graph.
				continue
			}
			m := module.Version{Path: p, Version: v}