chore(tazjin/rlox): Implement From<ScannerError> for bytecode errors

Change-Id: I446c6e38cf239a132882d37df156884d319ca111
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2553
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

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

@@ -1,15 +1,18 @@
+use crate::scanner::ScannerError;
+
 use std::fmt;
 
 #[derive(Debug)]
 pub enum ErrorKind {
-    // CompileError,
-    // RuntimeError,
+    UnexpectedChar(char),
+    UnterminatedString,
     InternalError(&'static str),
 }
 
 #[derive(Debug)]
 pub struct Error {
     pub kind: ErrorKind,
+    pub line: usize,
 }
 
 impl fmt::Display for Error {
@@ -18,4 +21,20 @@ impl fmt::Display for Error {
     }
 }
 
+impl From<ScannerError> for Error {
+    fn from(err: ScannerError) -> Self {
+        match err {
+            ScannerError::UnexpectedChar { line, unexpected } => Error {
+                line,
+                kind: ErrorKind::UnexpectedChar(unexpected),
+            },
+
+            ScannerError::UnterminatedString { line } => Error {
+                line,
+                kind: ErrorKind::UnterminatedString,
+            },
+        }
+    }
+}
+
 pub type LoxResult<T> = Result<T, Error>;