\ nesting.fs displays nesting for primitive trace 12jun97jaw
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0 nestlevel !
key dup 9 u> WHILE
CASE ': OF cr nestlevel @ spaces 1 nestlevel +! emit ENDOF
'; OF cr -1 nestlevel +! nestlevel @ spaces emit
cr nestlevel @ spaces ENDOF
dup OF dup 31 u> IF emit THEN ENDOF
REPEAT drop bye ;