// pkgpaths records all package import paths encountered while
	// visiting coverage data files (used to implement the "pkglist"
	// subcommand).
	pkgpaths map[string]struct{}

	// Current package name and import path.
	pkgName       string
	pkgImportPath string

	// Module path for current package (may be empty).
	modulePath string

	// Dump subcommand (ex: "textfmt", "debugdump", etc).
	cmd string

//
// Precondition: the Defs and Implicts maps are populated.
func (info *Info) PkgNameOf(imp *syntax.ImportDecl) *PkgName {
	var obj Object
	if imp.LocalPkgName != nil {
		obj = info.Defs[imp.LocalPkgName]
	} else {
		obj = info.Implicits[imp]
	}
	pkgname, _ := obj.(*PkgName)
	return pkgname
}

// TypeAndValue reports the type and value (for constants)
// of the corresponding expression.

	// (This code is only needed for dot-imports. Without them,
	// we only have to mark variables, see *Var case below).
	if pkgName := check.dotImportMap[dotImportKey{scope, obj.Name()}]; pkgName != nil {
		pkgName.used = true
	}

	switch obj := obj.(type) {
	case *PkgName:
		check.errorf(e, InvalidPkgUse, "use of package %s not in selector", obj.name)
		return

	case *Const:
		check.addDeclDep(obj)

	versions      map[*syntax.PosBase]string  // maps files to version strings (each file has an entry); shared with Info.FileVersions if present
	imports       []*PkgName                  // list of imported packages
	dotImportMap  map[dotImportKey]*PkgName   // maps dot-imported objects to the package they were dot-imported through
	recvTParamMap map[*syntax.Name]*TypeParam // maps blank receiver type parameters to their type

		pkgPathOff := r.uint64()
		pkgPath := p.stringAt(pkgPathOff)
		pkgName := p.stringAt(r.uint64())
		_ = r.uint64() // package height; unused by go/types

		if pkgPath == "" {
			pkgPath = path
		}
		pkg := imports[pkgPath]
		if pkg == nil {
			pkg = types.NewPackage(pkgPath, pkgName)
			imports[pkgPath] = pkg
		} else if pkg.Name() != pkgName {

	// (This code is only needed for dot-imports. Without them,
	// we only have to mark variables, see *Var case below).
	if pkgName := check.dotImportMap[dotImportKey{scope, obj.Name()}]; pkgName != nil {
		pkgName.used = true
	}

	switch obj := obj.(type) {
	case *PkgName:
		check.errorf(e, InvalidPkgUse, "use of package %s not in selector", obj.name)
		return

	case *Const:
		check.addDeclDep(obj)

		t.Error(out)
	}
}

func testSignalHandlers(t *testing.T, pkgname, cfile, cmd string) {
	if GOOS == "windows" {
		t.Skipf("Skipping on %s", GOOS)
	}
	globalSkip(t)
	testenv.MustHaveGoBuild(t)
	testenv.MustHaveCGO(t)
	testenv.MustHaveBuildMode(t, "c-shared")

	libname := pkgname + ".a"
	run(t,
		nil,
		"go", "build",
		"-buildmode=c-shared",

	}

	ctxt := Default
	all, err := listStdPkgs(ctxt.GOROOT)
	if err != nil {
		t.Fatal(err)
	}

	for _, pkgname := range all {
		if strings.ToLower(pkgname) != pkgname {
			t.Errorf("package %q should not use upper-case path", pkgname)
		}
	}
}

// TestFindImports tests that findImports works.  See #43249.
func TestFindImports(t *testing.T) {

func _() {
	A(B, nil // syntax error: missing ',' before newline in argument list
}
`
	f, err := syntax.Parse(syntax.NewFileBase(pkgName(src)), strings.NewReader(src), func(error) {}, nil, 0)
	if err == nil {
		t.Fatal("expected syntax error")
	}

	var conf Config
	conf.Check(f.PkgName.Value, []*syntax.File{f}, nil) // must not panic
}

func TestIssue61938(t *testing.T) {
	const src = `
package p

			return pkg, arg[0:period], symbol, false
		}
		// See if we have the basename or tail of a package, as in json for encoding/json
		// or ivy/value for robpike.io/ivy/value.
		pkgName := arg[:period]
		for {
			path, ok := findNextPackage(pkgName)
			if !ok {
				break
			}
			if pkg, err = build.ImportDir(path, build.ImportComment); err == nil {
				return pkg, arg[0:period], symbol, true
			}
		}