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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">Diego<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">Okay. Then it can be seen as ELSE of the CASE
</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Apple Color Emoji";mso-fareast-language:EN-US">😊</span><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">Jörg<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">Von:
</span></b><span style="font-size:12.0pt;color:black">Oberon <oberon-bounces@lists.inf.ethz.ch> im Auftrag von Diego Sardina <dsar@eml.cc><br>
<b>Datum: </b>Montag, 28. August 2023 um 13:40<br>
<b>An: </b>oberon@lists.inf.ethz.ch <oberon@lists.inf.ethz.ch><br>
<b>Betreff: </b>Re: [Oberon] Case statements containing base type labels<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">On Mon, Aug 28, 2023, at 13:15, <a href="mailto:joerg.straube@iaeth.ch">joerg.straube@iaeth.ch</a> wrote:<o:p></o:p></span></p>
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<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">August</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt"> </span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">In Oberon-07 it is defined as follows:</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">The type T of the case expression (case variable) may also be a record or pointer type. Then the</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">case labels
<b>must be extensions of T</b>, and in the statements Si labelled by Ti, the case variable is</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">considered as of type Ti.</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt"> </span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">PROCEDURE Draw (s: Shape)</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">BEGIN</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt"> CASE s OF</span></span><span style="font-size:11.0pt"><br>
<span class="size"> Rectangle: ... |</span><br>
<span class="size"> Circle: ... |</span><br>
<span class="size"> Shape: ... </span></span><span class="size"><span style="font-size:11.0pt;font-family:Symbol">ß</span></span><span class="size"><span style="font-size:11.0pt"> this is not allowed as “Shape” is not an extension of “Shape”</span></span><span style="font-size:11.0pt"><br>
<span class="size"> END</span><br>
<span class="size">END Draw;</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt"> </span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt">Jörg</span></span><o:p></o:p></p>
<p class="qt-msonormal1"><span class="size"><span style="font-size:11.0pt"> </span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span class="rynqvb"><span lang="EN" style="font-size:11.0pt">A record type is also an extension of itself. So that is valid.</span></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span class="rynqvb"><span lang="EN" style="font-size:11.0pt">--</span></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="rynqvb"><span lang="EN" style="font-size:11.0pt">Diego Sardina</span></span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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