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+// errorcheck
+
+// Copyright 2011 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 illegal shifts.
+// Issue 1708, illegal cases.
+// Does not compile.
+
+package p
+
+func f(x int) int { return 0 }
+func g(x interface{}) int { return 0 }
+func h(x float64) int { return 0 }
+
+// from the spec
+var (
+ s uint = 33
+ u = 1.0 << s // ERROR "invalid operation|shift of non-integer operand"
+ v float32 = 1 << s // ERROR "invalid"
+)
+
+// non-constant shift expressions
+var (
+ e1 = g(2.0 << s) // ERROR "invalid|shift of non-integer operand"
+ f1 = h(2 << s) // ERROR "invalid"
+ g1 int64 = 1.1 << s // ERROR "truncated"
+)
+
+// constant shift expressions
+const c uint = 65
+
+var (
+ a2 int = 1.0 << c // ERROR "overflow"
+ b2 = 1.0 << c // ERROR "overflow"
+ d2 = f(1.0 << c) // ERROR "overflow"
+)
+
+var (
+ // issues 4882, 4936.
+ a3 = 1.0<<s + 0 // ERROR "invalid|shift of non-integer operand"
+ // issue 4937
+ b3 = 1<<s + 1 + 1.0 // ERROR "invalid|shift of non-integer operand"
+ // issue 5014
+ c3 = complex(1<<s, 0) // ERROR "invalid|shift of type float64"
+ d3 int = complex(1<<s, 3) // ERROR "non-integer|cannot use.*as type int" "shift of type float64"
+ e3 = real(1 << s) // ERROR "invalid"
+ f3 = imag(1 << s) // ERROR "invalid"
+)
+
+// from the spec
+func _() {
+ var (
+ s uint = 33
+ i = 1 << s // 1 has type int
+ j int32 = 1 << s // 1 has type int32; j == 0
+ k = uint64(1 << s) // 1 has type uint64; k == 1<<33
+ m int = 1.0 << s // 1.0 has type int
+ n = 1.0<<s != i // 1.0 has type int; n == false if ints are 32bits in size
+ o = 1<<s == 2<<s // 1 and 2 have type int; o == true if ints are 32bits in size
+ // next test only fails on 32bit systems
+ // p = 1<<s == 1<<33 // illegal if ints are 32bits in size: 1 has type int, but 1<<33 overflows int
+ u = 1.0 << s // ERROR "non-integer|float64"
+ u1 = 1.0<<s != 0 // ERROR "non-integer|float64"
+ u2 = 1<<s != 1.0 // ERROR "non-integer|float64"
+ v float32 = 1 << s // ERROR "non-integer|float32"
+ w int64 = 1.0 << 33 // 1.0<<33 is a constant shift expression
+
+ _, _, _, _, _, _, _, _, _, _ = j, k, m, n, o, u, u1, u2, v, w
+ )
+
+ // non constants arguments trigger a different path
+ f2 := 1.2
+ s2 := "hi"
+ _ = f2 << 2 // ERROR "shift of type float64|non-integer"
+ _ = s2 << 2 // ERROR "shift of type string|non-integer"
+}
+
+// shifts in comparisons w/ untyped operands
+var (
+ _ = 1<<s == 1
+ _ = 1<<s == 1. // ERROR "invalid|shift of type float64"
+ _ = 1.<<s == 1 // ERROR "invalid|shift of type float64"
+ _ = 1.<<s == 1. // ERROR "invalid|non-integer|shift of type float64"
+
+ _ = 1<<s+1 == 1
+ _ = 1<<s+1 == 1. // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1. == 1 // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1. == 1. // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1 == 1 // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1 == 1. // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1. == 1 // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1. == 1. // ERROR "invalid|non-integer|shift of type float64"
+
+ _ = 1<<s == 1<<s
+ _ = 1<<s == 1.<<s // ERROR "invalid|shift of type float64"
+ _ = 1.<<s == 1<<s // ERROR "invalid|shift of type float64"
+ _ = 1.<<s == 1.<<s // ERROR "invalid|non-integer|shift of type float64"
+
+ _ = 1<<s+1<<s == 1
+ _ = 1<<s+1<<s == 1. // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1.<<s == 1 // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1.<<s == 1. // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1<<s == 1 // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1<<s == 1. // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1.<<s == 1 // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1.<<s == 1. // ERROR "invalid|non-integer|shift of type float64"
+
+ _ = 1<<s+1<<s == 1<<s+1<<s
+ _ = 1<<s+1<<s == 1<<s+1.<<s // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1<<s == 1.<<s+1<<s // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1<<s == 1.<<s+1.<<s // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1.<<s == 1<<s+1<<s // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1.<<s == 1<<s+1.<<s // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1.<<s == 1.<<s+1<<s // ERROR "invalid|shift of type float64"
+ _ = 1<<s+1.<<s == 1.<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
+ _ = 1.<<s+1<<s == 1<<s+1<<s // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1<<s == 1<<s+1.<<s // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1<<s == 1.<<s+1<<s // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1<<s == 1.<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
+ _ = 1.<<s+1.<<s == 1<<s+1<<s // ERROR "invalid|shift of type float64"
+ _ = 1.<<s+1.<<s == 1<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
+ _ = 1.<<s+1.<<s == 1.<<s+1<<s // ERROR "invalid|non-integer|shift of type float64"
+ _ = 1.<<s+1.<<s == 1.<<s+1.<<s // ERROR "invalid|non-integer|shift of type float64"
+)
+
+// shifts in comparisons w/ typed operands
+var (
+ x int
+ _ = 1<<s == x
+ _ = 1.<<s == x
+ _ = 1.1<<s == x // ERROR "truncated"
+
+ _ = 1<<s+x == 1
+ _ = 1<<s+x == 1.
+ _ = 1<<s+x == 1.1 // ERROR "truncated"
+ _ = 1.<<s+x == 1
+ _ = 1.<<s+x == 1.
+ _ = 1.<<s+x == 1.1 // ERROR "truncated"
+ _ = 1.1<<s+x == 1 // ERROR "truncated"
+ _ = 1.1<<s+x == 1. // ERROR "truncated"
+ _ = 1.1<<s+x == 1.1 // ERROR "truncated"
+
+ _ = 1<<s == x<<s
+ _ = 1.<<s == x<<s
+ _ = 1.1<<s == x<<s // ERROR "truncated"
+)
+
+// shifts as operands in non-arithmetic operations and as arguments
+func _() {
+ var s uint
+ var a []int
+ _ = a[1<<s]
+ _ = a[1.]
+ _ = a[1.<<s]
+ _ = a[1.1<<s] // ERROR "integer|shift of type float64"
+
+ _ = make([]int, 1)
+ _ = make([]int, 1.)
+ _ = make([]int, 1.<<s)
+ _ = make([]int, 1.1<<s) // ERROR "non-integer|truncated"
+
+ _ = float32(1)
+ _ = float32(1 << s) // ERROR "non-integer|shift of type float32"
+ _ = float32(1.)
+ _ = float32(1. << s) // ERROR "non-integer|shift of type float32"
+ _ = float32(1.1 << s) // ERROR "non-integer|shift of type float32"
+
+ _ = append(a, 1<<s)
+ _ = append(a, 1.<<s)
+ _ = append(a, 1.1<<s) // ERROR "truncated"
+
+ var b []float32
+ _ = append(b, 1<<s) // ERROR "non-integer|type float32"
+ _ = append(b, 1.<<s) // ERROR "non-integer|type float32"
+ _ = append(b, 1.1<<s) // ERROR "non-integer|type float32"
+
+ _ = complex(1.<<s, 0) // ERROR "non-integer|shift of type float64"
+ _ = complex(1.1<<s, 0) // ERROR "non-integer|shift of type float64"
+ _ = complex(0, 1.<<s) // ERROR "non-integer|shift of type float64"
+ _ = complex(0, 1.1<<s) // ERROR "non-integer|shift of type float64"
+
+ var a4 float64
+ var b4 int
+ _ = complex(1<<s, a4) // ERROR "non-integer|shift of type float64"
+ _ = complex(1<<s, b4) // ERROR "invalid|non-integer|"
+
+ var m1 map[int]string
+ delete(m1, 1<<s)
+ delete(m1, 1.<<s)
+ delete(m1, 1.1<<s) // ERROR "truncated|shift of type float64"
+
+ var m2 map[float32]string
+ delete(m2, 1<<s) // ERROR "invalid|cannot use 1 << s as type float32"
+ delete(m2, 1.<<s) // ERROR "invalid|cannot use 1 << s as type float32"
+ delete(m2, 1.1<<s) // ERROR "invalid|cannot use 1.1 << s as type float32"
+}
+
+// shifts of shifts
+func _() {
+ var s uint
+ _ = 1 << (1 << s)
+ _ = 1 << (1. << s)
+ _ = 1 << (1.1 << s) // ERROR "non-integer|truncated"
+ _ = 1. << (1 << s) // ERROR "non-integer|shift of type float64"
+ _ = 1. << (1. << s) // ERROR "non-integer|shift of type float64"
+ _ = 1.1 << (1.1 << s) // ERROR "invalid|non-integer|truncated"
+
+ _ = (1 << s) << (1 << s)
+ _ = (1 << s) << (1. << s)
+ _ = (1 << s) << (1.1 << s) // ERROR "truncated"
+ _ = (1. << s) << (1 << s) // ERROR "non-integer|shift of type float64"
+ _ = (1. << s) << (1. << s) // ERROR "non-integer|shift of type float64"
+ _ = (1.1 << s) << (1.1 << s) // ERROR "invalid|non-integer|truncated"
+
+ var x int
+ x = 1 << (1 << s)
+ x = 1 << (1. << s)
+ x = 1 << (1.1 << s) // ERROR "truncated"
+ x = 1. << (1 << s)
+ x = 1. << (1. << s)
+ x = 1.1 << (1.1 << s) // ERROR "truncated"
+
+ x = (1 << s) << (1 << s)
+ x = (1 << s) << (1. << s)
+ x = (1 << s) << (1.1 << s) // ERROR "truncated"
+ x = (1. << s) << (1 << s)
+ x = (1. << s) << (1. << s)
+ x = (1.1 << s) << (1.1 << s) // ERROR "truncated"
+
+ var y float32
+ y = 1 << (1 << s) // ERROR "non-integer|type float32"
+ y = 1 << (1. << s) // ERROR "non-integer|type float32"
+ y = 1 << (1.1 << s) // ERROR "invalid|truncated|float32"
+ y = 1. << (1 << s) // ERROR "non-integer|type float32"
+ y = 1. << (1. << s) // ERROR "non-integer|type float32"
+ y = 1.1 << (1.1 << s) // ERROR "invalid|truncated|float32"
+
+ var z complex128
+ z = (1 << s) << (1 << s) // ERROR "non-integer|type complex128"
+ z = (1 << s) << (1. << s) // ERROR "non-integer|type complex128"
+ z = (1 << s) << (1.1 << s) // ERROR "invalid|truncated|complex128"
+ z = (1. << s) << (1 << s) // ERROR "non-integer|type complex128"
+ z = (1. << s) << (1. << s) // ERROR "non-integer|type complex128"
+ z = (1.1 << s) << (1.1 << s) // ERROR "invalid|truncated|complex128"
+
+ _, _, _ = x, y, z
+}
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