4 files changed, 31 insertions, 7 deletions
diff --git a/c_parser/include/ast_declaration.hpp b/c_parser/include/ast_declaration.hpp
index 01b1498..72bd375 100644
--- a/c_parser/include/ast_declaration.hpp
+++ b/c_parser/include/ast_declaration.hpp
@@ -7,14 +7,27 @@
 
 // Declaration that holds a list of declarations
 
-class ast_Declaration : public ast_Base {
+class ast_DeclarationList : public ast_Base {
 private:
+    mutable std::vector<const ast_Base*> dec_list;
     
 public:
-    virtual void print() const = 0;
+    ast_DeclarationList(const ast_Base* _dec) {
+	dec_list.push_back(_dec);
+    }
+
+    virtual void print() const {
+	for(size_t i = 0; i < dec_list.size(); ++i) {
+	    dec_list[i]->print();
+	}
+    }
+
+    virtual void push(const ast_Base* _dec) const {
+	dec_list.push_back(_dec);
+    }
 };
 
-class ast_VariableDeclaration : public ast_Declaration {
+class ast_VariableDeclaration : public ast_Base {
 private:
     mutable std::vector<const ast_Base*> var_list;
     
@@ -24,7 +37,7 @@ public:
     }
 
     virtual void print() const {
-        for(int i = 0; i < var_list.size(); ++i) {
+        for(size_t i = 0; i < var_list.size(); ++i) {
 	    var_list[i]->print();
 	}
     }
diff --git a/c_parser/include/ast_function.hpp b/c_parser/include/ast_function.hpp
index 86230d1..1086f49 100644
--- a/c_parser/include/ast_function.hpp
+++ b/c_parser/include/ast_function.hpp
@@ -22,7 +22,10 @@ public:
 	std::cout << "</Function>" << std::endl;
     }
 
-    virtual void push(const ast_Base* var) const {}
+    virtual void push(const ast_Base* var) const {
+        std::cerr << "Error: Can't call this function on this class" << std::endl;
+	(void)var;
+    }
 };
 
 class ast_ParamList : public ast_Base {
diff --git a/c_parser/include/ast_primitives.hpp b/c_parser/include/ast_primitives.hpp
index d878780..5ae6d12 100644
--- a/c_parser/include/ast_primitives.hpp
+++ b/c_parser/include/ast_primitives.hpp
@@ -15,7 +15,10 @@ public:
         std::cout << "<Variable id=\"" << id << "\" />" << std::endl;
     }
 
-    virtual void push(const ast_Base* var) const {}
+    virtual void push(const ast_Base* var) const {
+	std::cerr << "Error: Can't call this function on this class" << std::endl;
+	(void)var;
+    }
 };
 
 class ast_Parameter : public ast_Base {
@@ -28,7 +31,10 @@ public:
         std::cout << "<Parameter id=\"" << id << "\" />" << std::endl;
     }
 
-    virtual void push(const ast_Base* var) const {}
+    virtual void push(const ast_Base* var) const {
+        std::cerr << "Error: Can't call this function on this class" << std::endl;
+	(void)var;
+    }
 };
 
 #endif
diff --git a/c_parser/include/ast_statement.hpp b/c_parser/include/ast_statement.hpp
index 725308b..f2c7175 100644
--- a/c_parser/include/ast_statement.hpp
+++ b/c_parser/include/ast_statement.hpp
@@ -6,6 +6,7 @@ protected:
     mutable std::vector<const ast_Base*> ast_list;
     
 public:
+    ast_Statement() {}
     ast_Statement(const ast_Base* _el) {
 	ast_list.push_back(_el);
     }
@@ -23,6 +24,7 @@ public:
 
 class ast_CompoundStatement : public ast_Statement {
 public:
+    ast_CompoundStatement() : ast_Statement() {}
     ast_CompoundStatement(const ast_Base* _el) : ast_Statement(_el) {}
 
     virtual void print() const override {