diff --git a/README.md b/README.md
index 9c10642..a3a5bae 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ DONE:
   - Math:
 
 TODO:
+- Prove turing complete
 - Do the intrinsic left
 - Quote, Quasiquote, etc.
 - Optimizing
diff --git a/blspc/src/compiler/compile.rs b/blspc/src/compiler/compile.rs
index 4647a18..14b2e34 100644
--- a/blspc/src/compiler/compile.rs
+++ b/blspc/src/compiler/compile.rs
@@ -52,7 +52,6 @@ impl Compiler {
                                 _ => {
                                     result.append(&mut self.compile_intrinsic(call, &cdr)?);
                                 }
-                                _ => { dbg!(call); unimplemented!() },
                             } // End `match call`
                         }, // End `Symbol(call)`
                         _ => { dbg!(car); unimplemented!() },
diff --git a/blspc/src/vm/instr.rs b/blspc/src/vm/instr.rs
index d291277..f13cae2 100644
--- a/blspc/src/vm/instr.rs
+++ b/blspc/src/vm/instr.rs
@@ -161,15 +161,17 @@ impl Register {
 
 impl Display for Register {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, "r{}", self.value)
+        write!(f, "%{}", self.value)
     }
 }
 
 impl FromStr for Register {
-    type Err = ();
+    type Err = String;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let value = s[1..].parse::<usize>().map_err(|_| ())?;
+        if !s.starts_with("%") { return Err(format!("Invalid register: {}", s)); }
+
+        let value = s[1..].parse::<usize>().map_err(|_| (format!("Invalid register: {}", s)))?;
         Ok(Register { value })
     }
 }
diff --git a/example/math.blsp b/example/math.blsp
index 1f2ec3e..8fdf481 100644
--- a/example/math.blsp
+++ b/example/math.blsp
@@ -1,2 +1,3 @@
+(fun cool_number (/ (+ 345 345) 10))
 (fun main
-    (print (/ (+ 345 345) 10)))
\ No newline at end of file
+    (print cool_number))
\ No newline at end of file
diff --git a/example/s.blsp b/example/s.blsp
deleted file mode 100644
index e69de29..0000000
diff --git a/test.sh b/test.sh
index 51e622e..30a4b38 100755
--- a/test.sh
+++ b/test.sh
@@ -2,12 +2,21 @@ in=$1             # Get first's file name
 noext=${in%.*}    # Remove extension
 name=${noext##*/} # Remove path
 
-make debug
-blspc compile $noext.blsp
-echo -e   "------------------------------------------- SOURCE"
-cat $noext.blsp
-echo -e "\n----------------------------------------- COMPILED"
-cat $name.bsm
-echo -e   "------------------------------------------- OUTPUT"
-blspc run $name.bsm
-echo -e   "--------------------------------------------------"
+echo $2
+# if $2 equal to "noecho"
+if [ $2 = "noecho" ];
+then
+    make debug; echo ""; blspc compile $noext.blsp; echo ""
+    cat $noext.blsp; echo -e "\n"; cat $name.bsm; echo ""
+    blspc run $name.bsm
+else
+    make debug
+    blspc compile $noext.blsp
+    echo -e   "------------------------------------------- SOURCE"
+    cat $noext.blsp
+    echo -e "\n----------------------------------------- COMPILED"
+    cat $name.bsm
+    echo -e   "------------------------------------------- OUTPUT"
+    blspc run $name.bsm
+    echo -e   "--------------------------------------------------"
+fi