Parsec library sucks in Frege 3.24-7.100

[zhou...@163.com]

I want to port a toy interpreter to android, I try parsec library https://github.com/alexander-myltsev/parsec-frege using it's own sample code and the parsec stuck and never return，how can I debug this library in this situation?

[zhou...@163.com]

When I switch to frege3.23.422, everything is OK. The following picture was my parsec frege3.24 build process while 3.23 build process does not have the last two warnings

在 2018年1月24日星期三 UTC+8下午1:40:57，zhou...@163.com写道：

[zhou...@163.com]

I use jvisualvm tool and found the flowing stack trace

在 2018年1月24日星期三 UTC+8下午1:40:57，zhou...@163.com写道：

I want to port a toy interpreter to android, I try parsec library https://github.com/alexander-myltsev/parsec-frege using it's own sample code and the parsec stuck and never return，how can I debug this library in this situation?

[zhou...@163.com]

I really suspect GenParser monad's pure function cause this issue

在 2018年1月24日星期三 UTC+8下午1:40:57，zhou...@163.com写道：

I want to port a toy interpreter to android, I try parsec library https://github.com/alexander-myltsev/parsec-frege using it's own sample code and the parsec stuck and never return，how can I debug this library in this situation?

[zhou...@163.com]

In order to get parsec compiled by frege 3.24, I change the GenParser monad's return x method to pure x, I don't know if this cause this issue

在 2018年1月24日星期三 UTC+8下午1:40:57，zhou...@163.com写道：

I want to port a toy interpreter to android, I try parsec library https://github.com/alexander-myltsev/parsec-frege using it's own sample code and the parsec stuck and never return，how can I debug this library in this situation?

[zhou...@163.com]

At last I give up and learn to use NanoParsec

在 2018年1月24日星期三 UTC+8下午1:40:57，zhou...@163.com写道：

I want to port a toy interpreter to android, I try parsec library https://github.com/alexander-myltsev/parsec-frege using it's own sample code and the parsec stuck and never return，how can I debug this library in this situation?

[Ingo W.]

Yes, it should be quite similar.

It is very difficult to interpret that stack trace from a distance, so I can't comment here.

[zhou...@163.com]

Thank you inventing Frege, absolutely life saver when I program BLE smart card reader on Android. I feel great confidence when I deal with dozen of callback per device and still get the things right, never had a chance to block the UI thread, never leak a resource. Thinking in asyn is so nature with Frege support. not just First class monad, monad transformer, Record , Continuation, STM, Parsec, REPL made me a better programmer, but the group of people devote the whole life to guarantee the new more abstract idea is keeping coming out

[Ingo W.]

Thank you for your nice words, I shall be happy if Frege helps you with your work.