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spec: various minor clarifications
- Allow for a type parameter as length/capacity to make. - Be slightly more precise in prose for append. - Add a couple of links. Change-Id: Ib97e528bab1ab55d271beeeb53d9bb7a07047b9b Reviewed-on: https://go-review.googlesource.com/c/go/+/391754 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -7116,8 +7116,9 @@ make(T, n) channel buffered channel of type T, buffer size n
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<p>
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Each of the size arguments <code>n</code> and <code>m</code> must be of <a href="#Numeric_types">integer type</a>
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or an untyped <a href="#Constants">constant</a>.
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Each of the size arguments <code>n</code> and <code>m</code> must be of <a href="#Numeric_types">integer type</a>,
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have a <a href="#Interface_types">type set</a> containing only integer types,
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or be an untyped <a href="#Constants">constant</a>.
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A constant size argument must be non-negative and <a href="#Representability">representable</a>
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by a value of type <code>int</code>; if it is an untyped constant it is given type <code>int</code>.
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If both <code>n</code> and <code>m</code> are provided and are constant, then
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@ -7154,9 +7155,9 @@ by the arguments overlaps.
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<p>
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The <a href="#Function_types">variadic</a> function <code>append</code>
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appends zero or more values <code>x</code> to a slice <code>s</code>
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and returns the resulting slice.
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and returns the resulting slice of the same type as <code>s</code>.
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The <a href="#Core_types">core type</a> of <code>s</code> must be a slice
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of the form <code>[]E</code>.
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of type <code>[]E</code>.
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The values <code>x</code> are passed to a parameter of type <code>...E</code>
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and the respective <a href="#Passing_arguments_to_..._parameters">parameter
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passing rules</a> apply.
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@ -7166,7 +7167,7 @@ followed by <code>...</code>. This form appends the bytes of the string.
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</p>
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<pre class="grammar">
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append(s S, x ...E) S // E is the element type of the core type of S
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append(s S, x ...E) S // core type of S is []E
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</pre>
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<p>
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@ -7922,11 +7923,17 @@ func Add(ptr Pointer, len IntegerType) Pointer
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func Slice(ptr *ArbitraryType, len IntegerType) []ArbitraryType
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</pre>
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<!--
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These conversions also apply to type parameters with suitable core types.
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Determine if we can simply use core type insted of underlying type here,
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of if the general conversion rules take care of this.
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-->
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<p>
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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 type of underlying type <code>Pointer</code> and vice versa.
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Any pointer or value of <a href="#Types">underlying type</a> <code>uintptr</code> can be
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<a href="#Conversions">converted</a> to 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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@ -7973,7 +7980,8 @@ uintptr(unsafe.Pointer(&x)) % unsafe.Alignof(x) == 0
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<p>
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A (variable of) type <code>T</code> has <i>variable size</i> if <code>T</code>
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is a type parameter, or if it is an array or struct type containing elements
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is a <a href="#Type_parameter_declarations">type parameter</a>, or if it is an
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array or struct type containing elements
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or fields of variable size. Otherwise the size is <i>constant</i>.
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Calls to <code>Alignof</code>, <code>Offsetof</code>, and <code>Sizeof</code>
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are compile-time <a href="#Constant_expressions">constant expressions</a> of
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