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doc/go1.18: document new overflow error for some untyped arguments to print/ln
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>
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@ -43,6 +43,19 @@ Do not send CLs removing the interior tags from such phrases.
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programs is likely very small.
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</p>
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<p>
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The Go 1.18 compiler now reports an overflow when passing a rune constant expression
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such as <code>'1' << 32</code> as an argument to the predeclared functions
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<code>print</code> and <code>println</code>, consistent with the behavior of
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user-defined functions. Before Go 1.18, the compiler did not report an error
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in such cases but silently accepted such constant arguments if they fit into an
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<code>int64</code>. As a result of this change, (possibly incorrect) programs
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may not compile anymore. The necessary fix is straightforward: fix the program if it
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was in fact incorrect, or explicitly convert the offending argument to the correct type.
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Since <code>go vet</code> always pointed out this error, the number of affected
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programs is likely very small.
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</p>
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<h3 id="generics">Generics</h3>
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<p>
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