return rhs.Info()&types.IsConstType == lhs.Info()&types.IsConstType
		}
	}
	return types.AssignableTo(want, got)
}

// MakeReadFile returns a simple implementation of the Pass.ReadFile function.
func MakeReadFile(pass *analysis.Pass) func(filename string) ([]byte, error) {
	return func(filename string) ([]byte, error) {
		if err := CheckReadable(pass, filename); err != nil {
			return nil, err

				ExportPackageFact: facts.ExportPackageFact,
				AllPackageFacts:   func() []analysis.PackageFact { return facts.AllPackageFacts(factFilter) },
			}
			pass.ReadFile = analysisinternal.MakeReadFile(pass)

			t0 := time.Now()
			act.result, act.err = a.Run(pass)

			if act.err == nil { // resolve URLs on diagnostics.
				for i := range act.diagnostics {