The quick check IF uses the syntax
IF <test> and prints the result of the evaluation of the
IF (true or false) to the terminal.
nM> set debug yes
nM> if debugisTrueINFO: Logical test = true
nM> set debug true
nM> if debugisTrueINFO: Logical test = true
nM> set debug on
nM> if debugisTrueINFO: Logical test = true
nM> set debug off
nM> if debugisTrueINFO: Logical test = false
nM>