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doc/go1.16: add vet release note for CL 235677
For #40700 Fixes #42895 Change-Id: I05b60f0d000512d5dddb3d61e0e695aa01943d6a Reviewed-on: https://go-review.googlesource.com/c/go/+/274617 Trust: Tim King <taking@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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@ -283,12 +283,55 @@ Do not send CLs removing the interior tags from such phrases.
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<h3 id="vet">Vet</h3>
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<p>
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TODO
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<h4 id="vet-string-int">New warning for invalid testing.T use in
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goroutines</h4>
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<!-- CL 235677: https://golang.org/cl/235677: cmd/vet: bring in pass to catch invalid uses of testing.T in goroutines -->
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<p><!-- CL 235677 -->
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The vet tool now warns about invalid calls to the <code>testing.T</code>
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method <code>Fatal</code> from within a goroutine created during the test.
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This also warns on calls to <code>Fatalf</code>, <code>FailNow</code>, and
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<code>Skip{,f,Now}</code> methods on <code>testing.T</code> tests or
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<code>testing.B</code> benchmarks.
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</p>
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<p>
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Calls to these methods stop the execution of the created goroutine and not
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the <code>Test*</code> or <code>Benchmark*</code> function. So these are
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<a href="/pkg/testing/#T.FailNow">required</a> to be called by the goroutine
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running the test or benchmark function. For example:
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</p>
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<pre>
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func TestFoo(t *testing.T) {
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go func() {
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if condition() {
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t.Fatal("oops") // This exits the inner func instead of TestFoo.
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}
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...
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}()
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}
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</pre>
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<p>
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Code calling <code>t.Fatal</code> (or a similar method) from a created
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goroutine should be rewritten to signal the test failure using
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<code>t.Error</code> and exit the goroutine early using an alternative
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method, such as using a <code>return</code> statement. The previous example
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could be rewritten as:
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</p>
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<pre>
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func TestFoo(t *testing.T) {
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go func() {
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if condition() {
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t.Error("oops")
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return
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}
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...
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}()
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}
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</pre>
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<p><!-- CL 248686, CL 276372 -->
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The vet tool now warns about amd64 assembly that clobbers the BP
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register (the frame pointer) without saving and restoring it,
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