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spec: type assertions and switches don't operate on type parameters
Change-Id: I11111b3617673be94508128489aed6488d518537 Reviewed-on: https://go-review.googlesource.com/c/go/+/366834 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -3884,8 +3884,9 @@ If the indices are out of range at run time, a <a href="#Run_time_panics">run-ti
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<h3 id="Type_assertions">Type assertions</h3>
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<p>
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For an expression <code>x</code> of <a href="#Interface_types">interface type</a>
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and a type <code>T</code>, the primary expression
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For an expression <code>x</code> of <a href="#Interface_types">interface type</a>,
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but not a <a href="#Type_parameters">type parameter</a>, and a type <code>T</code>,
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the primary expression
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</p>
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<pre>
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@ -5677,7 +5678,8 @@ switch x.(type) {
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<p>
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Cases then match actual types <code>T</code> against the dynamic type of the
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expression <code>x</code>. As with type assertions, <code>x</code> must be of
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<a href="#Interface_types">interface type</a>, and each non-interface type
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<a href="#Interface_types">interface type</a>, but not a
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<a href="#Type_parameters">type parameter</a>, and each non-interface type
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<code>T</code> listed in a case must implement the type of <code>x</code>.
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The types listed in the cases of a type switch must all be
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<a href="#Type_identity">different</a>.
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