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spec: clarify unsafe.Pointer conversions
A pointer type of underlying type unsafe.Pointer can be used in unsafe conversions. Document unfortunate status quo. Fixes #19306. Change-Id: I28172508a200561f8df366bbf2c2807ef3b48c97 Reviewed-on: https://go-review.googlesource.com/42132 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -1,6 +1,6 @@
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<!--{
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"Title": "The Go Programming Language Specification",
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"Subtitle": "Version of May 3, 2017",
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"Subtitle": "Version of May 9, 2017",
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"Path": "/ref/spec"
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}-->
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@ -6431,7 +6431,7 @@ func Sizeof(variable ArbitraryType) uintptr
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A <code>Pointer</code> is a <a href="#Pointer_types">pointer type</a> but a <code>Pointer</code>
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value may not be <a href="#Address_operators">dereferenced</a>.
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Any pointer or value of <a href="#Types">underlying type</a> <code>uintptr</code> can be converted to
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a <code>Pointer</code> type and vice versa.
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a type of underlying type <code>Pointer</code> and vice versa.
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The effect of converting between <code>Pointer</code> and <code>uintptr</code> is implementation-defined.
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</p>
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