3 // Copyright 2011 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
8 // Issue 1708, legal cases.
9 // Compiles but does not run.
13 func f(x int) int { return 0 }
14 func g(x interface{}) int { return 0 }
15 func h(x float64) int { return 0 }
20 i = 1 << s // 1 has type int
21 j int32 = 1 << s // 1 has type int32; j == 0
22 k = uint64(1 << s) // 1 has type uint64; k == 1<<33
23 l = g(1 << s) // 1 has type int
24 m int = 1.0 << s // legal: 1.0 has type int
25 w int64 = 1.0 << 33 // legal: 1.0<<33 is a constant shift expression
28 // non-constant shift expressions
30 a1 int = 2.0 << s // typeof(2.0) is int in this context => legal shift
31 d1 = f(2.0 << s) // typeof(2.0) is int in this context => legal shift
34 // constant shift expressions
38 a2 int = 2.0 << c // a2 == 64 (type int)
39 b2 = 2.0 << c // b2 == 64 (untyped integer)
40 _ = f(b2) // verify b2 has type int
41 c2 float64 = 2 << c // c2 == 64.0 (type float64)
42 d2 = f(2.0 << c) // == f(64)
43 e2 = g(2.0 << c) // == g(int(64))
44 f2 = h(2 << c) // == h(float64(64.0))