Rails multi-line debugging in bybog or how to save in a single line

Question

Sometimes I need to debug some unpleasant exception where its back trace is hidden or truncated, for example, ArgumentErrorwithout a stack trace.

I use to debug using beebug. The problem is that the byebug interpreter is REPL, so it is not possible to write multi-line code. I am trying to figure out how to make a built-in rescue and print the backtrace, i.e. I want a built-in, REPL compatible version

begin 
  .... 
rescue => e 
  puts e.backtrace.join("\n")
end

I tried

begin; my_crashing_method.call; rescue Exception => e; puts e.backtrace; end

But this line raises a SyntaxError

*** SyntaxError Exception: (byebug):1: syntax error, unexpected keyword_rescue
rescue Exception => e
      ^

I'm not sure what I am missing?

EDIT

The line above works fine on a regular IRB / Rails shell, but not from a byebug shell

ESO

begin my_crashing_method.call; rescue Exception => e; puts e.backtrace end

Stack trace completed successfully

Byebug

(byebug) begin; my_crashing_method.call; rescue Exception => e; puts e.backtrace
*** SyntaxError Exception: (byebug):1: syntax error, unexpected end-of-input
begin
     ^

nil
*** NameError Exception: undefined local variable or method `my_crashing_method' for #<StaticPagesController:0x007fae79f61088>

nil
*** SyntaxError Exception: (byebug):1: syntax error, unexpected keyword_rescue
rescue Exception => e
      ^

nil
*** NameError Exception: undefined local variable or method `e' for #<StaticPagesController:0x007fae79f61088>

nil