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doc/go1.18: document new overflow error for some untyped arguments to print/ln

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Fixes #49216.
For #47694.

Change-Id: Ib129d790c382ddcc9677d87db4ca827b7159856a
Reviewed-on: https://go-review.googlesource.com/c/go/+/366275
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2021-11-22 12:33:11 -08:00
parent 7fbe2f4cc8
commit 7456b94853
1 changed files with 13 additions and 0 deletions
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doc/go1.18.html
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@ -43,6 +43,19 @@ Do not send CLs removing the interior tags from such phrases.
programs is likely very small.
</p>
<p>
The Go 1.18 compiler now reports an overflow when passing a rune constant expression
such as <code>'1' << 32</code> as an argument to the predeclared functions
<code>print</code> and <code>println</code>, consistent with the behavior of
user-defined functions. Before Go 1.18, the compiler did not report an error
in such cases but silently accepted such constant arguments if they fit into an
<code>int64</code>. As a result of this change, (possibly incorrect) programs
may not compile anymore. The necessary fix is straightforward: fix the program if it
was in fact incorrect, or explicitly convert the offending argument to the correct type.
Since <code>go vet</code> always pointed out this error, the number of affected
programs is likely very small.
</p>
<h3 id="generics">Generics</h3>
<p>