name changes

src/main.rs

@@ -49,7 +49,7 @@ impl Program {
         self.vars.insert(argument_vec[0], argument_vec[1]);
     }
 
-    fn eval(&mut self, instruction: &String) {
+    fn parse(&mut self, instruction: &String) {
         let opcode = instruction.chars().collect::<Vec<char>>()[0];
         let arguments = &instruction[1..];
 
@@ -69,7 +69,7 @@ impl Program {
         while self.pc < self.data.len() {
             let instruction = self.data[self.pc].to_owned();
 
-            self.eval(&instruction);
+            self.parse(&instruction);
 
             self.pc = self.pc + 1;
         }
@@ -85,7 +85,7 @@ impl fmt::Display for Program {
 fn main() {
     let args: Vec<String> = env::args().collect();
     if args.len() == 1 {
-        panic!("You must provide an argument!");
+        panic!("You must provide a filename!");
     }
 
     let filename = &args[1];