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<message 
  url="2003/01/fb18c346f65204d6f3afadad83bd0f03"
  from="Mike Potanin &lt;potanin@m...&gt;"
  author="Mike Potanin"
  date="2003-01-29T11:04:06"
  subject="[Caml-list] AST and &quot;when&quot;"
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<thread subject="[Caml-list] AST and &quot;when&quot;">
<msg 
  url="2003/01/fb18c346f65204d6f3afadad83bd0f03"
  from="Mike Potanin &lt;potanin@m...&gt;"
  author="Mike Potanin"
  date="2003-01-29T11:04:06"
  subject="[Caml-list] AST and &quot;when&quot;">
<msg 
  url="2003/01/735ed9e71e88a4cf46dcfe0566d1b115"
  from="Olivier Andrieu &lt;andrieu@i...&gt;"
  author="Olivier Andrieu"
  date="2003-01-29T14:33:56"
  subject="Re: [Caml-list] AST and &quot;when&quot;">
<msg 
  url="2003/01/922b2da371598713ba9e6dd461b9df4a"
  from="Mike Potanin &lt;potanin@m...&gt;"
  author="Mike Potanin"
  date="2003-01-29T15:17:21"
  subject="Re: [Caml-list] AST and &quot;when&quot;">
<msg 
  url="2003/01/0494f07a636297e85ad88a73700c7d84"
  from="Olivier Andrieu &lt;andrieu@i...&gt;"
  author="Olivier Andrieu"
  date="2003-01-29T15:43:30"
  subject="Re: [Caml-list] AST and &quot;when&quot;">
<msg 
  url="2003/01/fa33962c45f49aeaef30c5b8c07a5fec"
  from="Mike Potanin &lt;potanin@m...&gt;"
  author="Mike Potanin"
  date="2003-01-29T16:35:48"
  subject="Re: [Caml-list] AST and &quot;when&quot;">
</msg>
</msg>
</msg>
</msg>
</msg>
</thread>

<contents>

Can CamlP4 make "when" in pattern?

# &lt;:patt&lt; a when a&lt;0 &gt;&gt;;;
            ^^^^
While expanding quotation "patt":
Parse error: end of input expected after [pattern] (in [pattern])
# &lt;:expr&lt; let p x = match x with a when a&lt;0 -&gt; 1 | b -&gt; b in p z &gt;&gt;;;
                                   ^^^^
While expanding quotation "expr":
Parse error: '-&gt;' expected after [ipatt] (in [expression])


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