bpo-42123: Run the parser two times and only enable invalid rules on the second run (GH-22111)
* Implement running the parser a second time for the errors messages
The first parser run is only responsible for detecting whether
there is a `SyntaxError` or not. If there isn't the AST gets returned.
Otherwise, the parser is run a second time with all the `invalid_*`
rules enabled so that all the customized error messages get produced.
diff --git a/Parser/pegen.h b/Parser/pegen.h
index 9a280ae..841f1e5 100644
--- a/Parser/pegen.h
+++ b/Parser/pegen.h
@@ -73,6 +73,7 @@ typedef struct {
growable_comment_array type_ignore_comments;
Token *known_err_token;
int level;
+ int call_invalid_rules;
} Parser;
typedef struct {