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 "float64"
+ u1 = 1.0<<s != 0 // ERROR "float64"
+ u2 = 1<<s != 1.0 // ERROR "float64"
+ v float32 = 1 << s // ERROR "float32"
+ w int64 = 1.0 << 33 // 1.0<<33 is a constant shift expression
+ )
+}
+
+// shifts in comparisons w/ untyped operands
var (
- a4 float64
- b4 int
- c4 = complex(1<<s, a4) // ERROR "shift of type float64"
- d4 = complex(1<<s, b4) // ERROR "invalid"
+ _ = 1<<s == 1
+ _ = 1<<s == 1. // ERROR "shift of type float64"
+ _ = 1.<<s == 1 // ERROR "shift of type float64"
+ _ = 1.<<s == 1. // ERROR "shift of type float64"
+
+ _ = 1<<s+1 == 1
+ _ = 1<<s+1 == 1. // ERROR "shift of type float64"
+ _ = 1<<s+1. == 1 // ERROR "shift of type float64"
+ _ = 1<<s+1. == 1. // ERROR "shift of type float64"
+ _ = 1.<<s+1 == 1 // ERROR "shift of type float64"
+ _ = 1.<<s+1 == 1. // ERROR "shift of type float64"
+ _ = 1.<<s+1. == 1 // ERROR "shift of type float64"
+ _ = 1.<<s+1. == 1. // ERROR "shift of type float64"
+
+ _ = 1<<s == 1<<s
+ _ = 1<<s == 1.<<s // ERROR "shift of type float64"
+ _ = 1.<<s == 1<<s // ERROR "shift of type float64"
+ _ = 1.<<s == 1.<<s // ERROR "shift of type float64"
+
+ _ = 1<<s+1<<s == 1
+ _ = 1<<s+1<<s == 1. // ERROR "shift of type float64"
+ _ = 1<<s+1.<<s == 1 // ERROR "shift of type float64"
+ _ = 1<<s+1.<<s == 1. // ERROR "shift of type float64"
+ _ = 1.<<s+1<<s == 1 // ERROR "shift of type float64"
+ _ = 1.<<s+1<<s == 1. // ERROR "shift of type float64"
+ _ = 1.<<s+1.<<s == 1 // ERROR "shift of type float64"
+ _ = 1.<<s+1.<<s == 1. // ERROR "shift of type float64"
+
+ _ = 1<<s+1<<s == 1<<s+1<<s
+ _ = 1<<s+1<<s == 1<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1<<s+1<<s == 1.<<s+1<<s // ERROR "shift of type float64"
+ _ = 1<<s+1<<s == 1.<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1<<s+1.<<s == 1<<s+1<<s // ERROR "shift of type float64"
+ _ = 1<<s+1.<<s == 1<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1<<s+1.<<s == 1.<<s+1<<s // ERROR "shift of type float64"
+ _ = 1<<s+1.<<s == 1.<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1<<s == 1<<s+1<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1<<s == 1<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1<<s == 1.<<s+1<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1<<s == 1.<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1.<<s == 1<<s+1<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1.<<s == 1<<s+1.<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1.<<s == 1.<<s+1<<s // ERROR "shift of type float64"
+ _ = 1.<<s+1.<<s == 1.<<s+1.<<s // ERROR "shift of type float64"
)
+
+// shifts in comparisons w/ typed operands
+var (
+ x int
+ _ = 1<<s == x
+ _ = 1.<<s == x
+ _ = 1.1<<s == x // ERROR "1.1 truncated"
+
+ _ = 1<<s+x == 1
+ _ = 1<<s+x == 1.
+ _ = 1<<s+x == 1.1 // ERROR "1.1 truncated"
+ _ = 1.<<s+x == 1
+ _ = 1.<<s+x == 1.
+ _ = 1.<<s+x == 1.1 // ERROR "1.1 truncated"
+ _ = 1.1<<s+x == 1 // ERROR "1.1 truncated"
+ _ = 1.1<<s+x == 1. // ERROR "1.1 truncated"
+ _ = 1.1<<s+x == 1.1 // ERROR "1.1 truncated"
+
+ _ = 1<<s == x<<s
+ _ = 1.<<s == x<<s
+ _ = 1.1<<s == x<<s // ERROR "1.1 truncated"
+)
+
+// shifts as operands in non-arithmetic operations and as arguments
+func _() {
+ var s uint
+ var a []int
+ _ = a[1<<s]
+ _ = a[1.]
+ // For now, the spec disallows these. We may revisit past Go 1.1.
+ _ = a[1.<<s] // ERROR "shift of type float64"
+ _ = a[1.1<<s] // ERROR "shift of type float64"
+
+ _ = make([]int, 1)
+ _ = make([]int, 1.)
+ _ = make([]int, 1.<<s)
+ _ = make([]int, 1.1<<s) // ERROR "1.1 truncated"
+
+ _ = float32(1)
+ _ = float32(1 << s) // ERROR "shift of type float32"
+ _ = float32(1.)
+ _ = float32(1. << s) // ERROR "shift of type float32"
+ _ = float32(1.1 << s) // ERROR "shift of type float32"
+
+ _ = append(a, 1<<s)
+ _ = append(a, 1.<<s)
+ _ = append(a, 1.1<<s) // ERROR "1.1 truncated"
+
+ var b []float32
+ _ = append(b, 1<<s) // ERROR "type float32"
+ _ = append(b, 1.<<s) // ERROR "type float32"
+ _ = append(b, 1.1<<s) // ERROR "type float32"
+
+ _ = complex(1.<<s, 0) // ERROR "shift of type float64"
+ _ = complex(1.1<<s, 0) // ERROR "shift of type float64"
+ _ = complex(0, 1.<<s) // ERROR "shift of type float64"
+ _ = complex(0, 1.1<<s) // ERROR "shift of type float64"
+
+ var a4 float64
+ var b4 int
+ _ = complex(1<<s, a4) // ERROR "shift of type float64"
+ _ = complex(1<<s, b4) // ERROR "invalid"
+
+ var m1 map[int]string
+ delete(m1, 1<<s)
+ delete(m1, 1.<<s)
+ delete(m1, 1.1<<s) // ERROR "1.1 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 "1.1 truncated"
+ _ = 1. << (1 << s) // ERROR "shift of type float64"
+ _ = 1. << (1. << s) // ERROR "shift of type float64"
+ _ = 1.1 << (1.1 << s) // ERROR "invalid|1.1 truncated"
+
+ _ = (1 << s) << (1 << s)
+ _ = (1 << s) << (1. << s)
+ _ = (1 << s) << (1.1 << s) // ERROR "1.1 truncated"
+ _ = (1. << s) << (1 << s) // ERROR "shift of type float64"
+ _ = (1. << s) << (1. << s) // ERROR "shift of type float64"
+ _ = (1.1 << s) << (1.1 << s) // ERROR "invalid|1.1 truncated"
+
+ var x int
+ x = 1 << (1 << s)
+ x = 1 << (1. << s)
+ x = 1 << (1.1 << s) // ERROR "1.1 truncated"
+ x = 1. << (1 << s)
+ x = 1. << (1. << s)
+ x = 1.1 << (1.1 << s) // ERROR "1.1 truncated"
+
+ x = (1 << s) << (1 << s)
+ x = (1 << s) << (1. << s)
+ x = (1 << s) << (1.1 << s) // ERROR "1.1 truncated"
+ x = (1. << s) << (1 << s)
+ x = (1. << s) << (1. << s)
+ x = (1.1 << s) << (1.1 << s) // ERROR "1.1 truncated"
+
+ var y float32
+ y = 1 << (1 << s) // ERROR "type float32"
+ y = 1 << (1. << s) // ERROR "type float32"
+ y = 1 << (1.1 << s) // ERROR "invalid|1.1 truncated|float32"
+ y = 1. << (1 << s) // ERROR "type float32"
+ y = 1. << (1. << s) // ERROR "type float32"
+ y = 1.1 << (1.1 << s) // ERROR "invalid|1.1 truncated|float32"
+
+ var z complex128
+ z = (1 << s) << (1 << s) // ERROR "type complex128"
+ z = (1 << s) << (1. << s) // ERROR "type complex128"
+ z = (1 << s) << (1.1 << s) // ERROR "invalid|1.1 truncated|complex128"
+ z = (1. << s) << (1 << s) // ERROR "type complex128"
+ z = (1. << s) << (1. << s) // ERROR "type complex128"
+ z = (1.1 << s) << (1.1 << s) // ERROR "invalid|1.1 truncated|complex128"
+}