Fix BF segfault

examples/brainfuck/generator.cpp

@@ -35,7 +35,7 @@ void Generator::run() {
 	while (!lbrackets.empty())
 		lbrackets.pop();
 	
-	for(int instruct = 0; instruct < program.size(); instruct++) {
+	for (std::size_t instruct = 0; instruct < program.size(); instruct++) {
 
 		switch(program[instruct]) {
 		case Instruction::EMPTY: break;

examples/brainfuck/parser.cpp

@@ -79,6 +79,8 @@ Parser::Token Parser::lex() {
 				//std::cout << "PARSING: found RBRACKET" << (int)Instruction::RBRACKET << std::endl;
                 return Token{ bfParser_Symbol::T_RBRACKET, std::move(p) };
 			}
+            default:
+                return Token { bfParser_Symbol::T_EOF, nullptr };
 		}
 	} catch(BfLexer::NoMoreTokens) {
 		return Token{ bfParser_Symbol::T_EOF, nullptr };
@@ -87,15 +89,13 @@ Parser::Token Parser::lex() {
 
 std::unique_ptr<std::deque<Instruction>> Parser::reduce_PROGRAM(std::deque<Token> subparts) {
 	// <program> ::= <instruction> <program>
-	if (subparts[1].value == nullptr)
-		return std::move(subparts[0].value);	 
 	for(auto& instr : *(subparts[1].value))
 		subparts[0].value->push_back(instr);
 	return std::move(subparts[0].value);
 }
-std::unique_ptr<std::deque<Instruction>> Parser::reduce_EMPTY(std::deque<Token> subparts) { 
+std::unique_ptr<std::deque<Instruction>> Parser::reduce_EMPTY(std::deque<Token>) { 
 	// <program> ::=
-	return nullptr;
+	return std::make_unique<std::deque<Instruction>>();
 }
 std::unique_ptr<std::deque<Instruction>> Parser::reduce_OPERATION(std::deque<Token> subparts) { 
 	// <instruction> ::= "PLUS" | "MINUS" | ... | "COMMA"

test_data/bf004.exp

@@ -1 +1 @@
-Hello World!
+Hello World!