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named1.go
// errorcheck // 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. // Does not compile. package main type Bool bool type Map map[int]int func (Map) M() {} type Slice []byte var slice Slice func asBool(Bool) {} func asString(String) {} type String string 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) // ok now asBool(i < j) // ok now _, b = m[2] // ok now var inter interface{} _, b = inter.(Map) // ok now _ = b var minter interface { M() } _, b = minter.(Map) // ok now _ = b _, bb := <-c asBool(bb) // ERROR "cannot use.*type bool.*as type Bool|cannot use bb" _, b = <-c // ok now _ = b asString(String(slice)) // ok }
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