# Pastebin opbqGKMP
scheme@(tabletop)> (+ 1 2)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Unbound variable: +

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(tabletop) [3]> ,bt
In current input:
    164:1  1 (_)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _) (+ 1 2)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Unbound variable: +

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(tabletop) [3]> ,bt
In current input:
    164:1  1 (_)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _)