Crystal: wrong stack trace number when using $X

[rdp]

0.26.1

somewhat minimal example:

$ cat file.cr
"" =~ /(abc)/
{a: $1, b: $2}
$ /usr/bin/crystal file.cr 
Unhandled exception: Nil assertion failed (Exception)
  from /usr/share/crystal/src/class.cr:148:0 in 'not_nil!'
  from file.cr:0:5 in '__crystal_main'
  from /usr/share/crystal/src/crystal/main.cr:97:5 in 'main_user_code'
  from /usr/share/crystal/src/crystal/main.cr:86:7 in 'main'
  from /usr/share/crystal/src/crystal/main.cr:106:3 in 'main'
  from __libc_start_main
  from ???

notice the "file.cr:0:5", not quite sure what line 0 means...wasn't sure if this is a dupe of other issues or not.

[ysbaddaden]

Related to #5567.

[straight-shoota]

The message Nil assertion failed is also not very detailed for this kind of error. Uers might have a hard time to understand what it means in this context.

[rdp]

this particular example seems fixed with 0.31.1. Feel free to close or leave open if you want to address the cryptic message at some point :)

[straight-shoota]

Fixed in #8234

The error message should better be a separate issue.

[straight-shoota]

There is already #4776 to track the error message/error behaviour.