Support explicit conversion of external function type to address

libsolidity/codegen/ContractCompiler.cpp

@@ -42,7 +42,7 @@ class StackHeightChecker
 public:
 	StackHeightChecker(CompilerContext const& _context):
 		m_context(_context), stackHeight(m_context.stackHeight()) {}
-	void check() { solAssert(m_context.stackHeight() == stackHeight, "I sense a disturbance in the stack."); }
+	void check() { solAssert(m_context.stackHeight() == stackHeight, "I sense a disturbance in the stack. "); }
 private:
 	CompilerContext const& m_context;
 	unsigned stackHeight;