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@@ -29,8 +29,14 @@ function repl() {
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   while (line != 'quit' && line != 'exit') {
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     var struct = parse(line);
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     if (struct) {
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-      var res = eval_(struct, env);
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-      print("-> " + res);
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+      try {
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+        var res = eval_(struct, env);
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+        print("-> " + res);
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+      } catch(e) {
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+        print("error: " + e);
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+        if (e.stack) print(e.stack);
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+        else if (e.fileName) print(e.fileName + ":" + e.lineNumber);
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+      }
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     }
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     pr("> ");
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     line = new String(readline());