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Source file src/go/types/object_test.go

Documentation: go/types

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package types
  
  import "testing"
  
  func TestIsAlias(t *testing.T) {
  	check := func(obj *TypeName, want bool) {
  		if got := obj.IsAlias(); got != want {
  			t.Errorf("%v: got IsAlias = %v; want %v", obj, got, want)
  		}
  	}
  
  	// predeclared types
  	check(Unsafe.Scope().Lookup("Pointer").(*TypeName), false)
  	for _, name := range Universe.Names() {
  		if obj, _ := Universe.Lookup(name).(*TypeName); obj != nil {
  			check(obj, name == "byte" || name == "rune")
  		}
  	}
  
  	// various other types
  	pkg := NewPackage("p", "p")
  	t1 := NewTypeName(0, pkg, "t1", nil)
  	n1 := NewNamed(t1, new(Struct), nil)
  	for _, test := range []struct {
  		name  *TypeName
  		alias bool
  	}{
  		{NewTypeName(0, nil, "t0", nil), false}, // no type yet
  		{NewTypeName(0, pkg, "t0", nil), false}, // no type yet
  		{t1, false},                             // type name refers to named type and vice versa
  		{NewTypeName(0, nil, "t2", new(Interface)), true}, // type name refers to unnamed type
  		{NewTypeName(0, pkg, "t3", n1), true},             // type name refers to named type with different type name
  		{NewTypeName(0, nil, "t4", Typ[Int32]), true},     // type name refers to basic type with different name
  		{NewTypeName(0, nil, "int32", Typ[Int32]), false}, // type name refers to basic type with same name
  		{NewTypeName(0, pkg, "int32", Typ[Int32]), true},  // type name is declared in user-defined package (outside Universe)
  		{NewTypeName(0, nil, "rune", Typ[Rune]), true},    // type name refers to basic type rune which is an alias already
  	} {
  		check(test.name, test.alias)
  	}
  }
  

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