ft: add debug script

src/disasm.rs

@@ -43,7 +43,7 @@ impl fmt::Display for DisasmError {
             DisasmError::IoError(msg) => write!(f, "{}", msg),
             DisasmError::OpcodeUndefined(opcode) => write!(
                 f,
-                "Error (Undefined Opcode). '{:#x} is considered undefined by the Spec",
+                "Error (Undefined Opcode). '{:#04x} is considered undefined by the Spec",
                 opcode
             ),
             DisasmError::IllegalGroupMnemonic(group, mnemonic) => write!(
@@ -244,6 +244,8 @@ impl Disassembler {
             rm
         );
 
+        // not unused, but overwritten before first read
+        #[allow(unused_assignments)]
         let mut displacement = None;
         match mode {
             0b00 => {