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Language-defined operator indications and operators are described
in a file as explained below.
The name of that file must be given as the value of the referto
parameter of an instantiation of the PreDefOp module:
$/Type/PreDefOp.gnrc +referto=(FILENAME) :inst
If this instantiation is contained in a .specs file and
if the description file (Semantic.d, for example) is contained
in the same directory, the instantiation may read:
$/Type/PreDefOp.gnrc +referto=(Semantic.d) :inst
If the .specs and Semantic.d files are contained in a
FunnelWeb specification, the same line can be used.