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spec: add another example for an invalid shift case

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Fixes #45114.

Change-Id: I969e5f1037254fc0ffbba2fc07a81a3987e6b05f
Reviewed-on: https://go-review.googlesource.com/c/go/+/379275
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2022-01-18 18:04:30 -08:00
parent 50869f377f
commit 4042194f2d
1 changed files with 3 additions and 2 deletions
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doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification - Go 1.18 Draft (incomplete)",
"Subtitle": "Version of Jan 10, 2022",
"Subtitle": "Version of Jan 18, 2022",
"Path": "/ref/spec"
}-->
@ -4259,7 +4259,8 @@ var p = 1&lt;&lt;s == 1&lt;&lt;33 // 1 has type int; p == true
var u = 1.0&lt;&lt;s // illegal: 1.0 has type float64, cannot shift
var u1 = 1.0&lt;&lt;s != 0 // illegal: 1.0 has type float64, cannot shift
var u2 = 1&lt;&lt;s != 1.0 // illegal: 1 has type float64, cannot shift
var v float32 = 1&lt;&lt;s // illegal: 1 has type float32, cannot shift
var v1 float32 = 1&lt;&lt;s // illegal: 1 has type float32, cannot shift
var v2 = string(1&lt;&lt;s) // illegal: 1 is converted to a string, cannot shift
var w int64 = 1.0&lt;&lt;33 // 1.0&lt;&lt;33 is a constant shift expression; w == 1&lt;&lt;33
var x = a[1.0&lt;&lt;s] // panics: 1.0 has type int, but 1&lt;&lt;33 overflows array bounds
var b = make([]byte, 1.0&lt;&lt;s) // 1.0 has type int; len(b) == 1&lt;&lt;33