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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:25:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:25:22 +0000 |
commit | f6ad4dcef54c5ce997a4bad5a6d86de229015700 (patch) | |
tree | 7cfa4e31ace5c2bd95c72b154d15af494b2bcbef /test/shift2.go | |
parent | Initial commit. (diff) | |
download | golang-1.22-f6ad4dcef54c5ce997a4bad5a6d86de229015700.tar.xz golang-1.22-f6ad4dcef54c5ce997a4bad5a6d86de229015700.zip |
Adding upstream version 1.22.1.upstream/1.22.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | test/shift2.go | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/shift2.go b/test/shift2.go new file mode 100644 index 0000000..adbfb77 --- /dev/null +++ b/test/shift2.go @@ -0,0 +1,45 @@ +// compile + +// 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 legal shifts. +// Issue 1708, legal cases. +// Compiles but does not run. + +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 + 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 + l = g(1 << s) // 1 has type int + m int = 1.0 << s // legal: 1.0 has type int + w int64 = 1.0 << 33 // legal: 1.0<<33 is a constant shift expression +) + +// non-constant shift expressions +var ( + a1 int = 2.0 << s // typeof(2.0) is int in this context => legal shift + d1 = f(2.0 << s) // typeof(2.0) is int in this context => legal shift +) + +// constant shift expressions +const c uint = 5 + +var ( + a2 int = 2.0 << c // a2 == 64 (type int) + b2 = 2.0 << c // b2 == 64 (untyped integer) + _ = f(b2) // verify b2 has type int + c2 float64 = 2 << c // c2 == 64.0 (type float64) + d2 = f(2.0 << c) // == f(64) + e2 = g(2.0 << c) // == g(int(64)) + f2 = h(2 << c) // == h(float64(64.0)) +) |