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- ( handle backspace: go back one char in IN>, if possible, then
- emit BS + SPC + BS )
- : _bs
- ( already at IN( ? )
- IN> @ IN( = IF EXIT THEN
- IN> @ 1- IN> !
- BS SPC BS
- ;
- ( del is same as backspace )
- : BS? DUP 0x7f = SWAP 0x8 = OR ;
- SYSVARS 0x55 + :** KEY
- ( cont.: read one char into input buffer and returns whether we
- should continue, that is, whether CR was not met. )
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