chore(tazjin/rlox): Set up some scaffolding for panic mode

This lets us suppress reporting of additional errors from the compiler
until a synchronisation point is reached.

Change-Id: Iacf90949f868fbdb4349750065b5e458cf74d32a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2557
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI

users/tazjin/rlox/src/bytecode/mod.rs

@@ -20,7 +20,10 @@ impl crate::Lox for Interpreter {
         Interpreter {}
     }
 
-    fn interpret(&mut self, code: String) -> Result<Self::Value, Vec<Self::Error>> {
+    fn interpret(
+        &mut self,
+        code: String,
+    ) -> Result<Self::Value, Vec<Self::Error>> {
         let chunk = compiler::compile(&code)?;
         vm::interpret(chunk).map_err(|e| vec![e])
     }