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doc/go1.15: mention vet warning for impossible type assertions

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Change-Id: Iab76baf50b79eda1e3acfd662d0e7830c7962f5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/234518
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Ian Lance Taylor 2020-05-18 15:44:33 -07:00
parent b0bc18d5bc
commit 0d39dba6de
1 changed files with 26 additions and 0 deletions
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doc/go1.15.html
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@ -157,6 +157,32 @@ TODO
the language.
</p>
<h4 id="vet-impossible-interface">New warning for impossible interface conversions</h4>
<p><!-- CL 218779, 232660 -->
The vet tool now warns about type assertions from one interface type
to another interface type when the type assertion will always fail.
This will happen if both interface types implement a method with the
same name but with a different type signature.
</p>
<p>
There is no reason to write a type assertion that always fails, so
any code that triggers this vet check should be rewritten.
</p>
<p>
This new vet check is enabled by default when using <code>go test</code>.
</p>
<p>
We are considering prohibiting impossible interface type assertions
in a future release of Go.
Such a language change would not be backward compatible.
We are using this vet check as a first trial step toward changing
the language.
</p>
<h2 id="runtime">Runtime</h2>
<p>