preven slime from exiting on repl error

src/eval.cpp

@@ -584,13 +584,21 @@ namespace Slime {
 
         Lisp_Object* parsed, * evaluated;
         while (true) {
-            delete_error();
+            if (Globals::error) {
+                log_error();
+                delete_error();
+            }
             fputs("> ", stdout);
             line = read_expression();
-            try_void parsed = Parser::parse_single_expression(line);
+            parsed = Parser::parse_single_expression(line);
+            if (Globals::error) {
+                continue;
+            }
             free(line);
-            try_void evaluated = eval_expr(parsed);
-            // try_void evaluated = eval_expr(parsed);
+            evaluated = eval_expr(parsed);
+            if (Globals::error) {
+                continue;
+            }
             if (evaluated && evaluated != Memory::nil) {
                 print(evaluated);
             }