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$ gsi
Gambit v4.6.2
> ,?
,? : Summary of comma commands
,h | ,(h X) : Help on procedure of last error or procedure/macro named X
,q : Terminate the process
,qt : Terminate the current thread
,t : Jump to toplevel REPL
,d : Jump to enclosing REPL
,c | ,(c X) : Continue the computation with stepping off
,s | ,(s X) : Continue the computation with stepping on (step)
,l | ,(l X) : Continue the computation with stepping on (leap)
,N : Move to specific continuation frame (N>=0)
,N+ | ,N- : Move forward/backward by N continuation frames (N>=0)
,+ | ,- : Like ,1+ and ,1-
,++ | ,-- : Like ,N+ and ,N- with N = nb. of frames at head of backtrace
,y : Display one-line summary of current frame
,i : Display procedure attached to current frame
,b | ,(b X) : Display backtrace of current continuation or X (cont/thread)
,be | ,(be X) : Like ,b and ,(b X) but also display environment
,bed | ,(bed X) : Like ,be and ,(be X) but also display dynamic environment
,e | ,(e X) : Display environment of current frame or X (proc/cont/thread)
,ed | ,(ed X) : Like ,e and ,(e X) but also display dynamic environment
,st | ,(st X) : Display current thread group, or X (thread/thread group)
,(v X) : Start a REPL visiting X (proc/cont/thread)
> ,q
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