Store super function.

libsolidity/ast/ASTAnnotations.h

@@ -94,6 +94,9 @@ struct ContractDefinitionAnnotation: TypeDeclarationAnnotation, DocumentedAnnota
 
 struct FunctionDefinitionAnnotation: ASTAnnotation, DocumentedAnnotation
 {
+	/// The function this function overrides, if any. This is always the closest
+	/// in the linearized inheritance hierarchy.
+	FunctionDefinition const* superFunction = nullptr;
 };
 
 struct EventDefinitionAnnotation: ASTAnnotation, DocumentedAnnotation

libsolidity/ast/ASTJsonConverter.cpp

@@ -328,6 +328,7 @@ bool ASTJsonConverter::visit(FunctionDefinition const& _node)
 		make_pair(m_legacy ? "constant" : "isDeclaredConst", _node.stateMutability() <= StateMutability::View),
 		make_pair("payable", _node.isPayable()),
 		make_pair("stateMutability", stateMutabilityToString(_node.stateMutability())),
+		make_pair("superFunction", idOrNull(_node.annotation().superFunction)),
 		make_pair("visibility", Declaration::visibilityToString(_node.visibility())),
 		make_pair("parameters", toJson(_node.parameterList())),
 		make_pair("isConstructor", _node.isConstructor()),