addFunction2Param method
Registers a two-parameter function; an existing one of the same name is kept.
Implementation
void addFunction2Param(String name, Func2 fn) {
if (findIdent(name) >= 0) return;
_identList.add(IdentRecord(
name: name.toUpperCase(),
kind: IdentKind.function_,
pCount: 2,
func2: fn,
));
}