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+// 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.
+
+// Issue 13821. Additional regress tests.
+
+package p
+
+type B bool
+type B2 bool
+
+var b B
+var b2 B2
+var x1 = b && 1 < 2 // x1 has type B, not ideal bool
+var x2 = 1 < 2 && b // x2 has type B, not ideal bool
+var x3 = b && b2 // ERROR "mismatched types B and B2|incompatible types"
+var x4 = x1 && b2 // ERROR "mismatched types B and B2|incompatible types"
+var x5 = x2 && b2 // ERROR "mismatched types B and B2|incompatible types"
+var x6 = b2 && x1 // ERROR "mismatched types B2 and B|incompatible types"
+var x7 = b2 && x2 // ERROR "mismatched types B2 and B|incompatible types"
+
+var x8 = b && !B2(true) // ERROR "mismatched types B and B2|incompatible types"