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doc/go1.18: add documentation for changes to go/types
The number of involved CLs is too large (hundreds) so no CLs are mentioned in (html) comments. Updates #47694 Change-Id: I655d800a1e56a71e9d70a190f1c42c17baf6861e Reviewed-on: https://go-review.googlesource.com/c/go/+/369099 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -451,6 +451,93 @@ Do not send CLs removing the interior tags from such phrases.
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</dd>
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</dl>
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<dl id="go/types"><dt><a href="/pkg/go/types/">go/types</a></dt>
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<dd>
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<p><!-- https://golang.org/issue/47916 -->
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Per the proposal
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<a href="https://go.googlesource.com/proposal/+/master/design/47916-parameterized-go-types.md">
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Additions to go/types to support type parameters
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</a>
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the following additions are made to the <a href="/pkg/go/types"><code>go/types</code></a> package:
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</p>
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<ul>
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<li>
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The new type
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<a href="/pkg/go/types/#TypeParam"><code>TypeParam</code></a>, factory function
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<a href="/pkg/go/types/#NewTypeParam"><code>NewTypeParam</code></a>,
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and associated methods were added to represent a type parameter.
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</li>
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<li>
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The new type
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<a href="/pkg/go/types/#TypeParamList"><code>TypeParamList</code></a> holds a list of
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type parameters.
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</li>
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<li>
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The new type
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<a href="/pkg/go/types/#TypeList"><code>TypeList</code></a> and factory function
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<a href="/pkg/go/types/#NewTypeList"><code>NewTypeList</code></a> facilitate storing
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a list of types.
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</li>
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<li>
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The new factory function
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<a href="/pkg/go/types/#NewSignatureType"><code>NewSignatureType</code></a> allocates a
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<a href="/pkg/go/types/#Signature"><code>Signature</code></a> with
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(receiver or function) type parameters.
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To access those type parameters, the <code>Signature</code> type has two new methods
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<a href="/pkg/go/types/#Signature.RecvTypeParams"><code>Signature.RecvTypeParams</code></a> and
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<a href="/pkg/go/types/#Signature.TypeParams"><code>Signature.TypeParams</code></a>.
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</li>
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<li>
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<a href="/pkg/go/types/#Named"><code>Named</code></a> types have four new methods:
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<a href="/pkg/go/types/#Named.Origin"><code>Named.Origin</code></a> to get the original
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parameterized types of instantiated types,
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<a href="/pkg/go/types/#Named.TypeArgs"><code>Named.TypeArgs</code></a> and
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<a href="/pkg/go/types/#Named.TypeParams"><code>Named.TypeParams</code></a> to get the
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type arguments or type parameters of an instantiated or parameterized type, and
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<a href="/pkg/go/types/#Named.TypeParams"><code>Named.SetTypeParams</code></a> to set the
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type parameters (for instance, when importing a named type where allocation of the named
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type and setting of type parameters cannot be done both at once due to possible cycles).
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</li>
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<li>
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The <a href="/pkg/go/types/#Interface"><code>Interface</code></a> type has four new methods:
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<a href="/pkg/go/types/#Interface.IsComparable"><code>Interface.IsComparable</code></a> and
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<a href="/pkg/go/types/#Interface.IsMethodSet"><code>Interface.IsMethodSet</code></a> to
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query properties of the type set defined by the interface, and
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<a href="/pkg/go/types/#Interface.MarkImplicit"><code>Interface.MarkImplicit</code></a> and
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<a href="/pkg/go/types/#Interface.IsImplicit"><code>Interface.IsImplicit</code></a> to set
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and test whether the interface is an implicit interface around a type constraint literal.
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</li>
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<li>
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The new types
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<a href="/pkg/go/types/#Union"><code>Union</code></a> and
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<a href="/pkg/go/types/#Term"><code>Term</code></a>, factory functions
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<a href="/pkg/go/types/#NewUnion"><code>NewUnion</code></a> and
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<a href="/pkg/go/types/#NewTerm"><code>NewTerm</code></a>, and associated
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methods were added to represent type sets in interfaces.
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</li>
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<li>
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The new function
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<a href="/pkg/go/types/#Instantiate"><code>Instantiate</code></a>
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instantiates a parameterized type.
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</li>
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<li>
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The new <a href="/pkg/go/types/#Info.Instances"><code>Info.Instances</code></a>
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map records function and type instantiations through the new
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<a href="/pkg/go/types/#Instance"><code>Instance</code></a> type.
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</li>
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<li><!-- CL 342671 -->
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The new type <a href="/pkg/go/types/#ArgumentError"><code>ArgumentError</code></a>
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and associated methods were added to represent an error related to a type argument.
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</li>
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<li><!-- CL 353089 -->
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The new type <a href="/pkg/go/types/#Context"><code>Context</code></a> and factory function
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<a href="/pkg/go/types/#NewContext"><code>NewContext</code></a>
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were added to facilitate sharing of identical type instances across type-checked packages.
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</li>
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</ul>
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</dd>
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</dl>
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<dl id="image/draw"><dt><a href="/pkg/image/draw/">image/draw</a></dt>
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<dd>
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<p><!-- CL 340049 -->
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