if err != nil {
		t.Fatal(err)
	}

	// map import paths to importDecl
	imports := make(map[string]*ast.ImportSpec)
	for _, s := range f.Decls[0].(*ast.GenDecl).Specs {
		if imp, _ := s.(*ast.ImportSpec); imp != nil {
			imports[imp.Path.Value] = imp
		}
	}

	for _, test := range tests {
		imp := imports[test.path]
		if imp == nil {

				r.Align = p.PtrSize
			}
			return r
		}
		// Look up the type in the top level declarations.
		// TODO: Handle types defined within a function.
		for _, d := range p.Decl {
			gd, ok := d.(*ast.GenDecl)
			if !ok || gd.Tok != token.TYPE {
				continue
			}
			for _, spec := range gd.Specs {
				ts, ok := spec.(*ast.TypeSpec)
				if !ok {
					continue
				}
				if ts.Name.Name == t.Name {

	case *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.ChanType:
		return true
	case *ast.Ident:
		// TODO: Handle types defined within function.
		for _, d := range p.Decl {
			gd, ok := d.(*ast.GenDecl)
			if !ok || gd.Tok != token.TYPE {
				continue
			}
			for _, spec := range gd.Specs {
				ts, ok := spec.(*ast.TypeSpec)
				if !ok {
					continue
				}
				if ts.Name.Name == t.Name {