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go/test/shift1.go
Ian Lance Taylor 8259b0136e test: avoid "declared but not used" errors in shift1.go 
I'm improving gccgo's detection of variables that are only set
but not used, and it triggers additional errors on this code.
The new gccgo errors are correct; gc seems to suppress them
due to the other, expected, errors.  This change uses the
variables so that no compiler will complain.

gccgo change is https://golang.org/cl/119920043 .

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/116050043
2014-07-20 12:25:24 -07:00

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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" "as type float32"
)
// non-constant shift expressions
var (
e1 = g(2.0 << s) // ERROR "invalid|shift of non-integer operand" "as type interface"
f1 = h(2 << s) // ERROR "invalid" "as type float64"
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
)
}
// 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.]
// For now, the spec disallows these. We may revisit past Go 1.1.
_ = a[1.<<s] // ERROR "integer|shift of type float64"
_ = 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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