Initial commit: Go 1.23 release state

test/fixedbugs/issue13273.go

@@ -0,0 +1,55 @@
+// errorcheck
+
+// Copyright 2015 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.
+
+// Check that we correctly construct (and report errors)
+// for unary expressions of the form <-x where we only
+// know after parsing x whether <-x is a receive operation
+// or a channel type.
+
+package n
+
+func f() {
+	// test case from issue 13273
+	<-chan int((chan int)(nil))
+
+	<-chan int(nil)
+	<-chan chan int(nil)
+	<-chan chan chan int(nil)
+	<-chan chan chan chan int(nil)
+	<-chan chan chan chan chan int(nil)
+
+	<-chan<-chan int(nil)
+	<-chan<-chan<-chan int(nil)
+	<-chan<-chan<-chan<-chan int(nil)
+	<-chan<-chan<-chan<-chan<-chan int(nil)
+
+	<-chan (<-chan int)(nil)
+	<-chan (<-chan (<-chan int))(nil)
+	<-chan (<-chan (<-chan (<-chan int)))(nil)
+	<-chan (<-chan (<-chan (<-chan (<-chan int))))(nil)
+
+	<-(<-chan int)(nil)
+	<-(<-chan chan int)(nil)
+	<-(<-chan chan chan int)(nil)
+	<-(<-chan chan chan chan int)(nil)
+	<-(<-chan chan chan chan chan int)(nil)
+
+	<-(<-chan<-chan int)(nil)
+	<-(<-chan<-chan<-chan int)(nil)
+	<-(<-chan<-chan<-chan<-chan int)(nil)
+	<-(<-chan<-chan<-chan<-chan<-chan int)(nil)
+
+	<-(<-chan (<-chan int))(nil)
+	<-(<-chan (<-chan (<-chan int)))(nil)
+	<-(<-chan (<-chan (<-chan (<-chan int))))(nil)
+	<-(<-chan (<-chan (<-chan (<-chan (<-chan int)))))(nil)
+
+	type _ <-<-chan int // ERROR "unexpected <-, expected chan|expected .*chan.*"
+	<-<-chan int // ERROR "unexpected <-, expected chan|expecting {" (new parser: same error as for type decl)
+
+	type _ <-chan<-int // ERROR "unexpected int, expected chan|expected .*chan.*|expected chan|expected .*;.* or .*}.* or newline"
+	<-chan<-int // ERROR "unexpected int, expected chan|expecting {" (new parser: same error as for type decl)
+}