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<h2 id="sec:errors"><a id="sec:8.8"><span class="sec-nr">8.8</span> <span class="sec-title">Compiler
Errors and Warnings</span></a></h2>
<a id="sec:errors"></a> In this section we summarize the most important
error and warning messages of the CHR compiler.
<p><h3 id="sec:chr-errors"><a id="sec:8.8.1"><span class="sec-nr">8.8.1</span> <span class="sec-title">CHR
Compiler Errors</span></a></h3>
<a id="sec:chr-errors"></a>
<dl class="latex">
<dt><b>Type clash</b></dt>
<dd>
for variable ... in rule ...
<p>This error indicates an inconsistency between declared types; a
variable can not belong to two types. See static type checking.</dd>
<dt><b>Invalid functor</b></dt>
<dd>
in head ... of rule ...
<p>This error indicates an inconsistency between a declared type and the
use of a functor in a rule. See static type checking.</dd>
<dt><b>Cyclic alias</b></dt>
<dd>
definition: ... == ...
<p>You have defined a type alias in terms of itself, either directly or
indirectly.</dd>
<dt><b>Ambiguous type aliases</b></dt>
<dd>
<p>You have defined two overlapping type aliases.</dd>
<dt><b>Multiple definitions</b></dt>
<dd>
for type
<p>You have defined the same type multiple times.</dd>
<dt><b>Non-ground type</b></dt>
<dd>
in constraint definition: ...
<p>You have declared a non-ground type for a constraint argument.</dd>
<dt><b>Could not find type definition</b></dt>
<dd>
for ...
<p>You have used an undefined type in a type declaration.</dd>
<dt><b>Illegal mode/type declaration</b></dt>
<dd>
<p>You have used invalid syntax in a constraint declaration.</dd>
<dt><b>Constraint multiply defined</b></dt>
<dd>
<p>There is more than one declaration for the same constraint.</dd>
<dt><b>Undeclared constraint</b></dt>
<dd>
... in head of ...
<p>You have used an undeclared constraint in the head of a rule. This
often indicates a misspelled constraint name or wrong number of
arguments.</dd>
<dt><b>Invalid pragma</b></dt>
<dd>
... in ... Pragma should not be a variable.
<p>You have used a variable as a pragma in a rule. This is not allowed.</dd>
<dt><b>Invalid identifier</b></dt>
<dd>
... in pragma passive in ...
<p>You have used an identifier in a passive pragma that does not
correspond to an identifier in the head of the rule. Likely the
identifier name is misspelled.</dd>
<dt><b>Unknown pragma</b></dt>
<dd>
... in ...
<p>You have used an unknown pragma in a rule. Likely the pragma is
misspelled or not supported.</dd>
<dt><b>Something unexpected</b></dt>
<dd>
happened in the CHR compiler
<p>You have most likely bumped into a bug in the CHR compiler. Please
contact Tom Schrijvers to notify him of this error.
<p></dd>
</dl>
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