Finish draft of post 8 in compiler series

08/examples/works1.txt

@@ -1,2 +1,2 @@
-defn main = { plus 320 6 }
-defn plus x y = { x + y }
+defn main = { sum 320 6 }
+defn sum x y = { x + y }

08/examples/works3.txt

@@ -5,3 +5,4 @@ defn length l = {
         Cons x xs -> { 1 + length xs }
     }
 }
+defn main = { length (Cons 1 (Cons 2 (Cons 3 Nil))) }

08/examples/works4.txt

@@ -0,0 +1,16 @@
+data List = { Nil, Cons Int List }
+
+defn add x y = { x + y }
+defn mul x y = { x * y }
+
+defn foldr f b l = {
+    case l of {
+        Nil -> { b }
+        Cons x xs -> { f x (foldr f b xs) }
+    }
+}
+
+defn main = {
+    foldr add 0 (Cons 1 (Cons 2 (Cons 3 (Cons 4 Nil)))) +
+    foldr mul 1 (Cons 1 (Cons 2 (Cons 3 (Cons 4 Nil))))
+}

08/examples/works5.txt

@@ -0,0 +1,17 @@
+data List = { Nil, Cons Int List }
+
+defn sumZip l m = {
+    case l of {
+        Nil -> { 0 }
+        Cons x xs -> {
+            case m of {
+                Nil -> { 0 }
+                Cons y ys -> { x + y + sumZip xs ys }
+            }
+        }
+    }
+}
+
+defn ones = { Cons 1 ones }
+
+defn main = { sumZip ones (Cons 1 (Cons 2 (Cons 3 Nil))) }

08/main.cpp

@@ -108,12 +108,12 @@ void output_llvm(llvm_context& ctx, const std::string& filename) {
         std::error_code ec;
         llvm::raw_fd_ostream file(filename, ec, llvm::sys::fs::F_None);
         if (ec) {
-            std::cerr << "Could not open output file: " << ec.message() << std::endl;
+            throw 0;
         } else {
             llvm::TargetMachine::CodeGenFileType type = llvm::TargetMachine::CGFT_ObjectFile;
             llvm::legacy::PassManager pm;
             if (targetMachine->addPassesToEmitFile(pm, file, NULL, type)) {
-                std::cerr << "Unable to emit target code" << std::endl;
+                throw 0;
             } else {
                 pm.run(ctx.module);
                 file.close();
@@ -136,7 +136,6 @@ void gen_llvm(const std::vector<definition_ptr>& prog) {
     for(auto& definition : prog) {
         definition->gen_llvm_second(ctx);
     }
-    llvm::verifyModule(ctx.module);
     ctx.module.print(llvm::outs(), nullptr);
     output_llvm(ctx, "program.o");
 }