Updated REPL to be more forgiving once errors occur

src/main.nim

@@ -87,11 +87,7 @@ proc repl =
                 continue
             elif input == "":
                 continue
-            else:
-                current &= input & "\n"
-            if current.len() == 0:
-                continue
-            tokens = tokenizer.lex(current, "stdin")
+            tokens = tokenizer.lex(current & input & "\n", "stdin")
             if tokens.len() == 0:
                 continue
             when debugLexer:
@@ -142,6 +138,7 @@ proc repl =
                 else:
                     styledEcho fgRed, "Corrupted"
             vm.run(serialized.chunk)
+            current &= input & "\n"
         except LexingError:
             print(LexingError(getCurrentException()))
         except ParseError: