p.declare(fileScope, pkgScope, obj)
				}
			} else if name != "_" {
				// declare imported package object in file scope
				// (do not re-use pkg in the file scope but create
				// a new object instead; the Decl field is different
				// for different files)
				obj := NewObj(Pkg, name)
				obj.Decl = spec
				obj.Data = pkg.Data
				p.declare(fileScope, pkgScope, obj)
			}
		}

// resolution. tok is used to format position in error messages.
func resolveFile(file *ast.File, handle *token.File, declErr func(token.Pos, string)) {
	pkgScope := ast.NewScope(nil)
	r := &resolver{
		handle:   handle,
		declErr:  declErr,
		topScope: pkgScope,
		pkgScope: pkgScope,
		depth:    1,
	}

	for _, decl := range file.Decls {
		ast.Walk(r, decl)
	}

	r.closeScope()

	lit string      // token literal

	// Non-syntactic parser control
	exprLev int // < 0: in control clause, >= 0: in expression

	// Ordinary identifier scopes
	pkgScope   *ast.Scope        // pkgScope.Outer == nil
	topScope   *ast.Scope        // top-most scope; may be pkgScope
	unresolved []*ast.Ident      // unresolved identifiers
	imports    []*ast.ImportSpec // list of imports

	// Label scope
	// (maintained by open/close LabelScope)

func (r *reader) ident(marker pkgbits.SyncMarker) (*types.Package, string) {
	r.Sync(marker)
	return r.pkg(), r.String()
}

// pkgScope returns pkg.Scope().
// If pkg is nil, it returns types.Universe instead.
//
// TODO(mdempsky): Remove after x/tools can depend on Go 1.19.
func pkgScope(pkg *types.Package) *types.Scope {
	if pkg != nil {
		return pkg.Scope()
	}
	return types.Universe
}