Swap out execution status for instructions returning an InstructionResult

src/instructions.rs

@@ -6,9 +6,13 @@ static INSTRUCTIONS: Lazy<[Option<OpcodeHandler>; 32]> = Lazy::new(|| {
     instructions
 });
 
-use crate::{consts::Word, core::Core, decode::Instruction};
+use crate::{
+    consts::Word,
+    core::{Core, InstructionResult},
+    decode::Instruction,
+};
 
-type Runner = fn(&mut Core, Instruction) -> Result<(), ()>;
+type Runner = fn(&mut Core, Instruction) -> Result<(), InstructionResult>;
 
 #[derive(Clone, Copy)]
 struct InstructionHandler {