Ruby: exclude methods with calls to 'super'

when the call has no arguments

Author: yoff

ruby/ql/src/queries/variables/UnusedParameter.ql

@@ -25,5 +25,9 @@ class RelevantParameterVariable extends LocalVariable {
 
 from RelevantParameterVariable v
 where
-  not exists(Ssa::WriteDefinition def | def.getWriteAccess().getAstNode() = v.getDefiningAccess())
+  not exists(Ssa::WriteDefinition def | def.getWriteAccess().getAstNode() = v.getDefiningAccess()) and
+  not exists(SuperCall s | s.getEnclosingCallable().getAParameter().getAVariable() = v |
+    // a call to 'super' without any arguments will pass on the parameter.
+    not exists(s.getAnArgument())
+  )
 select v, "The parameter '" + v.getName() + "' is never used."