diff --git a/dust-lang/src/chunk.rs b/dust-lang/src/chunk.rs
index d6b4322..35036d5 100644
--- a/dust-lang/src/chunk.rs
+++ b/dust-lang/src/chunk.rs
@@ -1,4 +1,7 @@
-use std::fmt::{self, Debug, Display};
+use std::{
+    fmt::{self, Debug, Display},
+    path::PathBuf,
+};
 
 use colored::Colorize;
 use serde::{Deserialize, Serialize};
@@ -280,27 +283,16 @@ impl Display for Chunk {
 
 impl Debug for Chunk {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let timestamp = std::time::SystemTime::now()
-            .duration_since(std::time::UNIX_EPOCH)
-            .unwrap()
-            .as_secs();
+        let executable = std::env::current_exe().unwrap_or_else(|_| PathBuf::new());
+        let disassembly = self
+            .disassembler(&executable.to_string_lossy())
+            .styled(false)
+            .disassemble();
 
         if cfg!(debug_assertions) {
-            write!(
-                f,
-                "\n{}\n",
-                self.disassembler(&format!("Dust Program 0x{timestamp:x}"))
-                    .styled(false)
-                    .disassemble()
-            )
+            write!(f, "\n{}", disassembly)
         } else {
-            write!(
-                f,
-                "{}",
-                self.disassembler(&format!("Dust Program 0x{timestamp:x}"))
-                    .styled(false)
-                    .disassemble()
-            )
+            write!(f, "{}", disassembly)
         }
     }
 }
diff --git a/dust-lang/src/parser.rs b/dust-lang/src/parser.rs
index 82d34c4..c83a7fd 100644
--- a/dust-lang/src/parser.rs
+++ b/dust-lang/src/parser.rs
@@ -9,7 +9,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::{
     AnnotatedError, Chunk, ChunkError, DustError, FunctionType, Identifier, Instruction, LexError,
-    Lexer, Operation, Span, Token, TokenKind, TokenOwned, Type, Value,
+    Lexer, Local, Operation, Span, Token, TokenKind, TokenOwned, Type, Value,
 };
 
 pub fn parse(source: &str) -> Result<Chunk, DustError> {
@@ -654,10 +654,10 @@ impl<'src> Parser<'src> {
         self.advance()?;
 
         let local_index = self.parse_identifier_from(token, start_position)?;
-        let to_register = self
+        let is_mutable = self
             .chunk
             .get_local(local_index, start_position)?
-            .register_index;
+            .is_mutable;
 
         if self.allow(Token::Equal)? {
             if !allowed.assignment {
@@ -667,11 +667,6 @@ impl<'src> Parser<'src> {
                 });
             }
 
-            let is_mutable = self
-                .chunk
-                .get_local(local_index, start_position)?
-                .is_mutable;
-
             if !is_mutable {
                 return Err(ParseError::CannotMutateImmutableVariable {
                     identifier: self.chunk.get_identifier(local_index).cloned().unwrap(),
@@ -700,15 +695,14 @@ impl<'src> Parser<'src> {
 
             self.emit_instruction(previous_instruction, previous_position);
             self.emit_instruction(
-                Instruction::set_local(self.current_register, local_index),
+                Instruction::set_local(previous_instruction.a(), local_index),
                 start_position,
             );
-            self.increment_register()?;
 
             self.parsed_expression = false;
         } else {
             self.emit_instruction(
-                Instruction::get_local(to_register, local_index),
+                Instruction::get_local(self.current_register, local_index),
                 self.previous_position,
             );
 
diff --git a/dust-shell/src/main.rs b/dust-shell/src/main.rs
index d5d3fb7..3cff27f 100644
--- a/dust-shell/src/main.rs
+++ b/dust-shell/src/main.rs
@@ -2,7 +2,7 @@ use std::{fs::read_to_string, io::Write};
 
 use clap::Parser;
 use colored::Colorize;
-use dust_lang::{format, parse, run, Chunk, DustError, Vm};
+use dust_lang::{format, parse, run};
 use log::Level;
 
 #[derive(Parser)]
@@ -23,10 +23,6 @@ struct Cli {
     #[arg(short = 'o', long)]
     format_colored: bool,
 
-    /// Whether to run the source code
-    #[arg(short, long)]
-    no_run: bool,
-
     /// Whether to output the disassembled chunk
     #[arg(short, long)]
     parse: bool,
@@ -72,40 +68,6 @@ fn main() {
         return;
     };
 
-    if !args.no_run {
-        if args.format {
-            format_source(source, args.format_line_numbers, args.format_colored);
-        }
-
-        let run_result = if args.parse {
-            let chunk = parse(source).unwrap();
-            let disassembly = chunk
-                .disassembler("Dust CLI Input")
-                .source(source)
-                .styled(args.style_disassembly)
-                .disassemble();
-
-            println!("{}", disassembly);
-
-            let mut vm = Vm::new(chunk);
-
-            vm.run()
-                .map_err(|error| DustError::Runtime { error, source })
-        } else {
-            run(source)
-        };
-
-        match run_result {
-            Ok(Some(value)) => println!("{}", value),
-            Ok(_) => {}
-            Err(error) => {
-                eprintln!("{}", error.report());
-            }
-        }
-
-        return;
-    }
-
     if args.format {
         format_source(source, args.format_line_numbers, args.format_colored);
     }
@@ -113,9 +75,15 @@ fn main() {
     if args.parse {
         parse_source(source, args.style_disassembly);
     }
+
+    if args.format || args.parse {
+        return;
+    }
+
+    run_source(source);
 }
 
-pub fn format_source(source: &str, line_numbers: bool, colored: bool) {
+fn format_source(source: &str, line_numbers: bool, colored: bool) {
     log::info!("Formatting source");
 
     match format(source, line_numbers, colored) {
@@ -126,19 +94,29 @@ pub fn format_source(source: &str, line_numbers: bool, colored: bool) {
     }
 }
 
-fn parse_source(source: &str, styled: bool) -> Option<Chunk> {
-    parse(source)
-        .inspect(|chunk| {
+fn parse_source(source: &str, styled: bool) {
+    match parse(source) {
+        Ok(chunk) => {
             let disassembly = chunk
                 .disassembler("Dust CLI Input")
                 .source(source)
                 .styled(styled)
                 .disassemble();
 
-            println!("{disassembly}",);
-        })
-        .inspect_err(|error| {
+            println!("{}", disassembly);
+        }
+        Err(error) => {
             eprintln!("{}", error.report());
-        })
-        .ok()
+        }
+    }
+}
+
+fn run_source(source: &str) {
+    match run(source) {
+        Ok(Some(value)) => println!("{}", value),
+        Ok(None) => {}
+        Err(error) => {
+            eprintln!("{}", error.report());
+        }
+    }
 }