Files
mruby-mruby/mrbgems/mruby-fiber
dearblue 9af6264d6b Implement Fiber#to_s method
If the filename and line number cannot be obtained, "(unknown):1" is used instead.

Also, the file name information of the terminated fiber cannot be retrieved and will be replaced as well.
This limitation is due to the fact that `cibase->proc` of the terminated fiber is collected by the GC.

```console
% bin/mruby -e 'p Fiber.new { p Fiber.current }.resume'
#<Fiber:0x82423bef0 -e:1 (resumed)>
#<Fiber:0x82423bef0 (unknown):1 (terminated)>
```
2023-12-01 21:30:16 +09:00
..
2023-12-01 21:30:16 +09:00