Initial commit: Go 1.23 release state

test/chan/perm.go

@@ -0,0 +1,70 @@
+// 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 various correct and incorrect permutations of send-only,
+// receive-only, and bidirectional channels.
+// Does not compile.
+
+package main
+
+var (
+	cr <-chan int
+	cs chan<- int
+	c  chan int
+)
+
+func main() {
+	cr = c  // ok
+	cs = c  // ok
+	c = cr  // ERROR "illegal types|incompatible|cannot"
+	c = cs  // ERROR "illegal types|incompatible|cannot"
+	cr = cs // ERROR "illegal types|incompatible|cannot"
+	cs = cr // ERROR "illegal types|incompatible|cannot"
+
+	var n int
+	<-n    // ERROR "receive from non-chan|expected channel"
+	n <- 2 // ERROR "send to non-chan|must be channel"
+
+	c <- 0       // ok
+	<-c          // ok
+	x, ok := <-c // ok
+	_, _ = x, ok
+
+	cr <- 0      // ERROR "send"
+	<-cr         // ok
+	x, ok = <-cr // ok
+	_, _ = x, ok
+
+	cs <- 0      // ok
+	<-cs         // ERROR "receive"
+	x, ok = <-cs // ERROR "receive"
+	_, _ = x, ok
+
+	select {
+	case c <- 0: // ok
+	case x := <-c: // ok
+		_ = x
+
+	case cr <- 0: // ERROR "send"
+	case x := <-cr: // ok
+		_ = x
+
+	case cs <- 0: // ok
+	case x := <-cs: // ERROR "receive"
+		_ = x
+	}
+
+	for _ = range cs { // ERROR "receive"
+	}
+
+	for range cs { // ERROR "receive"
+	}
+
+	close(c)
+	close(cs)
+	close(cr) // ERROR "receive"
+	close(n)  // ERROR "invalid operation.*non-chan type|must be channel|non-channel"
+}