go/test/named1.go

// errchk $G -e $D/$F.go

// Copyright 2009 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.

// Test that basic operations on named types are valid
// and preserve the type.

package main

type Bool bool

type Map map[int]int
func (Map) M() {}

func asBool(Bool) {}

func main() {
	var (
		b Bool = true;
		i, j int;
		c = make(chan int);
		m = make(Map);
	)

	asBool(b);
	asBool(!b);
	asBool(true);
	asBool(*&b);
	asBool(Bool(true));
	asBool(1!=2);	// ERROR "cannot use.*type bool.*as type Bool"
	asBool(i < j);	// ERROR "cannot use.*type bool.*as type Bool"

	_, b = m[2];	// ERROR "cannot .* bool.*type Bool"
	m[2] = 1, b;	// ERROR "cannot use.*type Bool.*as type bool"

	b = c<-1;	// ERROR "cannot use.*type bool.*type Bool"
	_ = b;
	asBool(c<-1);	// ERROR "cannot use.*type bool.*as type Bool"

	_, b = <-c;	// ERROR "cannot .* bool.*type Bool"
	_ = b;

	var inter interface{};
	_, b = inter.(Map);	// ERROR "cannot .* bool.*type Bool"
	_ = b;

	var minter interface{M()};
	_, b = minter.(Map);	// ERROR "cannot .* bool.*type Bool"
	_ = b;

	asBool(closed(c));	// ERROR "cannot use.*type bool.*as type Bool"
	b = closed(c);		// ERROR "cannot use.*type bool.*type Bool"
	_ = b;
}