Abstract contract and inheritance

- Checking the linearized base contracts for abstract functions and
  handle their existence appropriately

- If a contract is abstract it can't be created with new

- An abstract contract is not compiled (no backend code is generated)

- Of course tests

1 files changed, 1 insertions, 0 deletions

diff --git a/AST.h b/AST.h
index c1da90cd..8570e7bd 100644
--- a/AST.h
+++ b/AST.h
@@ -283,6 +283,7 @@ public:
 
 private:
 	void checkIllegalOverrides() const;
+	void checkAbstractFunctions();
 
 	std::vector<std::pair<FixedHash<4>, FunctionTypePointer>> const& getInterfaceFunctionList() const;