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spec: unsafe.Alignof/Sizeof also accept non-variable arguments
Both gc and gccgo permit calls such as unsafe.Sizeof(42). The spec only permits variable arguments. This is a (backward-compatible) spec change reflecting the status quo. Seems preferrable over restricting the compilers. R=r, rsc, iant, ken CC=golang-dev https://golang.org/cl/6494140
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<!--{
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<!--{
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"Title": "The Go Programming Language Specification",
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"Title": "The Go Programming Language Specification",
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"Subtitle": "Version of September 13, 2012",
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"Subtitle": "Version of September 17, 2012",
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"Path": "/ref/spec"
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"Path": "/ref/spec"
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}-->
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}-->
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@ -5487,8 +5487,9 @@ Any pointer or value of <a href="#Types">underlying type</a> <code>uintptr</code
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a <code>Pointer</code> and vice versa.
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a <code>Pointer</code> and vice versa.
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</p>
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</p>
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<p>
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<p>
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The function <code>Sizeof</code> takes an expression denoting a
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The functions <code>Alignof</code> and <code>Sizeof</code> take an expression <code>x</code>
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variable of any type and returns the size of the variable in bytes.
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of any type and return the alignment or size, respectively, of a hypothetical variable <code>v</code>
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as if <code>v</code> was declared via <code>var v = x</code>.
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</p>
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</p>
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<p>
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<p>
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The function <code>Offsetof</code> takes a selector (§<a href="#Selectors">Selectors</a>) denoting a struct
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The function <code>Offsetof</code> takes a selector (§<a href="#Selectors">Selectors</a>) denoting a struct
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