orig    *Alias         // original, uninstantiated alias
	tparams *TypeParamList // type parameters, or nil
	targs   *TypeList      // type arguments, or nil
	fromRHS Type           // RHS of type alias declaration; may be an alias
	actual  Type           // actual (aliased) type; never an alias
}

// NewAlias creates a new Alias type with the given type name and rhs.
// rhs must not be nil.
func NewAlias(obj *TypeName, rhs Type) *Alias {

		os.Setenv("CC", compilerEnvLookup("CC", defaultcc, gohostos, gohostarch))
		goCmd(nil, gorootBinGo, "build", "-o", pathf("%s/go_%s_%s_exec%s", gorootBin, goos, goarch, exe), wrapperPath)
		// Restore environment.
		// TODO(elias.naur): support environment variables in goCmd?
		os.Setenv("GOOS", goos)
		os.Setenv("GOARCH", goarch)
		os.Setenv("CC", oldcc)
	}

	if distpack {

			// this information explicitly in the object.
			var alias bool
			if check.conf.EnableAlias {
				alias = obj.IsAlias()
			} else {
				if d := check.objMap[obj]; d != nil {
					alias = d.tdecl.Alias // package-level object
				} else {
					alias = obj.IsAlias() // function local object
				}
			}
			if !alias {
				ndef++
			}
		case *Func:
			// ignored for now
		default:

		{NewTypeName(nopos, nil, "rune", Typ[Rune]), true},                // type name refers to basic type rune which is an alias already
		{t5, false}, // type name refers to type parameter and vice versa
	} {
		check(test.name, test.alias)
	}
}

// TestEmbeddedMethod checks that an embedded method is represented by
// the same Func Object as the original method. See also go.dev/issue/34421.

	alias("sync/atomic", "LoadUint32", "internal/runtime/atomic", "Load", all...)
	alias("sync/atomic", "LoadUint64", "internal/runtime/atomic", "Load64", all...)
	alias("sync/atomic", "LoadUintptr", "internal/runtime/atomic", "Load", p4...)
	alias("sync/atomic", "LoadUintptr", "internal/runtime/atomic", "Load64", p8...)

	alias("sync/atomic", "StoreInt32", "internal/runtime/atomic", "Store", all...)

					w.string("/* type parameter */")
				}
			}
		}

	case *Alias:
		w.typeName(t.obj)
		if list := t.targs.list(); len(list) != 0 {
			// instantiated type
			w.typeList(list)
		}
		if w.ctxt != nil {
			// TODO(gri) do we need to print the alias type name, too?
			w.typ(Unalias(t.obj.typ))
		}

	default:
		// For externally defined implementations of Type.

	// of an error message. ErrorURL must be a format string containing
	// exactly one "%s" format, e.g. "[go.dev/e/%s]".
	ErrorURL string

	// If EnableAlias is set, alias declarations produce an Alias type. Otherwise
	// the alias information is only in the type name, which points directly to
	// the actual (aliased) type.
	//
	// This setting must not differ among concurrent type-checking operations,

//             Pos       Pos
//             Name      stringOff
//             Recv      Param
//             Signature Signature
//         }
//     }
//
//     type Alias struct {
//         Tag  byte // 'A'
//         Pos  Pos
//         Type typeOff
//     }
//
//     // "Automatic" declaration of each typeparam
//     type TypeParam struct {
//         Tag        byte // 'P'

		}

		if name.Addrtaken() || !name.OnStack() {
			// Global variable, heap escaped, or just addrtaken.
			// Conservatively assume any memory access might alias.
			memWrite = true
			continue
		}

		// Local, non-addrtaken variable.
		// Assignments can only alias with direct uses of this variable.
		assigned.Add(name)
	}

	early.Append(late.Take()...)
	return early
}

	iface.NumMethods() // unlike go/types, there is no Complete() method, so we complete implicitly
}

func TestNewAlias_Issue65455(t *testing.T) {
	obj := NewTypeName(nopos, nil, "A", nil)
	alias := NewAlias(obj, Typ[Int])
	alias.Underlying() // must not panic
}

func TestIssue15305(t *testing.T) {
	const src = "package p; func f() int16; var _ = f(undef)"
	f := mustParse(src)
	conf := Config{