How to get error line while executing ruby code in playground.

[Hareramrai]

I was using the playground editor with below code snippet.

puts "welcome"
puts "Hi" + 9
puts "hello"

The above code produces the below error.

welcome
TypeError: no implicit conversion of Number into String

Could you help me to get the line number line while display the above error?

[hmdne]

It is possible to solve this issue, but would require porting some deal of private API from Opal

[hmdne]

Fixed by #148