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+/* Error codes passed around between file input, tokenizer, parser and
+ interpreter. This was necessary so we can turn them into Python
+ exceptions at a higher level. */
+
+#define E_OK 10 /* No error */
+#define E_EOF 11 /* (Unexpected) EOF read */
+#define E_INTR 12 /* Interrupted */
+#define E_TOKEN 13 /* Bad token */
+#define E_SYNTAX 14 /* Syntax error */
+#define E_NOMEM 15 /* Ran out of memory */
+#define E_DONE 16 /* Parsing complete */
+#define E_ERROR 17 /* Execution error */