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author | Robert Griesemer <gri@golang.org> | 2011-05-25 10:26:06 -0700 |
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committer | Robert Griesemer <gri@golang.org> | 2011-05-25 10:26:06 -0700 |
commit | 8c2078796d79fee91cf8078df037cd36f84ea1b2 (patch) | |
tree | b9378aca995ef6399a034d1d5ccd79e5dac1c46e /test/shift2.go | |
parent | 519090729961e4ea27db6a81ca248de3da33c41d (diff) | |
download | go-8c2078796d79fee91cf8078df037cd36f84ea1b2.tar.gz go-8c2078796d79fee91cf8078df037cd36f84ea1b2.zip |
test: test cases for issue 1708.
R=rsc
CC=golang-dev
https://golang.org/cl/4548058
Diffstat (limited to 'test/shift2.go')
-rw-r--r-- | test/shift2.go | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/test/shift2.go b/test/shift2.go new file mode 100644 index 0000000000..b08b37b7f9 --- /dev/null +++ b/test/shift2.go @@ -0,0 +1,42 @@ +// $G $D/$F.go && $L $F.$A && ./$A.out + +// 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. + +// Issue 1708, legal cases. + +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 + 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)) +) |