parser now bubbles errors instead of unit type

llvm added to dependencies

src/codegen/llvm_ir.rs

@@ -0,0 +1,11 @@
+use crate::ast::Literal;
+
+pub trait LLVMIRTranslation {
+    fn llvm_translate(&self) -> Result<String, ()>;
+}
+
+impl LLVMIRTranslation for crate::ast::Literal {
+    fn llvm_translate(&self) -> Result<String, ()> {
+        todo!()
+    }
+}