diff --git a/src/main.rs b/src/main.rs
index e487b03..e196144 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,7 +7,7 @@ fn main() {
     let arg = &args
         .next()
         .unwrap_or_else(|| find_in_splpath("repl.spl").expect("no file to be run"));
-    if arg == "--build" || arg == "--run" {
+    if arg == "--build" || arg == "--run" || arg == "--buildrun" {
         let file = args.next().unwrap();
         let data = fs::read_to_string(file.clone()).expect("unable to read specified file");
         let build_only = arg == "--build";
@@ -29,14 +29,17 @@ fn main() {
         if build_only {
             println!("Building...");
         }
-        let app = builder.build(build_only).unwrap();
+        let app = builder.build(build_only || arg == "--buildrun").unwrap();
         if build_only {
             println!("Built! Binary is {}", app.get_binary());
         } else {
             let mut args: Vec<String> = args.collect();
             args.insert(0, file);
             let mut command = app.execute(args).unwrap();
-            app.delete();
+            if arg != "--buildrun" {
+                println!("spl: cleaning temporary dir (run with --buildrun to keep)");
+                app.delete();
+            }
             command.wait().unwrap();
         }
 
diff --git a/src/oxidizer/mod.rs b/src/oxidizer/mod.rs
index 1fb2804..a7be31f 100644
--- a/src/oxidizer/mod.rs
+++ b/src/oxidizer/mod.rs
@@ -146,16 +146,16 @@ impl RustAppBuilder {
         let mut code = String::new();
         for func in self.rust_functions.into_iter().enumerate() {
             code += &format!(
-                "fn spl_oxidizer_{}(stack: &mut Stack) -> OError {{ {} Ok(()) }}",
+                "fn spl_oxidizer_{}(stack: &mut Stack) -> OError {{ {} Ok(()) }}\n",
                 func.0, func.1.content
             );
             runtime_init += &format!(
-                "rt.native_functions.insert({:?}, (0, FuncImpl::Native(spl_oxidizer_{})));",
+                "rt.native_functions.insert({:?}, (0, FuncImpl::Native(spl_oxidizer_{})));\n",
                 func.1.fn_name, func.0
             )
         }
         for (name, data) in self.to_embed.into_iter() {
-            runtime_init += &format!("rt.embedded_files.insert({:?}, {:?});", name, data);
+            runtime_init += &format!("rt.embedded_files.insert({:?}, {:?});\n", name, data);
         }
         fs::write(
             format!("{tmp}/spl-{name}/src/main.rs"),
diff --git a/src/oxidizer/splrs.rs b/src/oxidizer/splrs.rs
index dce495f..8468531 100644
--- a/src/oxidizer/splrs.rs
+++ b/src/oxidizer/splrs.rs
@@ -4,12 +4,16 @@ use super::RustFunction;
 
 /// Parses a #-expression and returns the string to be inserted in its place.
 fn parse_hash_expr(s: String, name: &str) -> String {
+    if &s == "drop" {
+        return "let _ = stack.pop();".to_owned();
+    }
     if &s == "pop" {
         return "stack.pop().lock_ro()".to_owned();
     }
     if &s == "pop_mut" {
         return "stack.pop().lock()".to_owned();
     }
+    // TODO: broken. fix.
     if &s == "pop:Array" {
         return format!("{{ require_array_on_stack!(tmp, stack, {name:?}); tmp }}");
     }