Just after example 1.28, in page 30:
The [] method with no arguments will return the currently associated default value. variables can
always be obtained by using the stem. However, this is not the same as using a compound variable
whose derived name is the null string
The underscored statement looks like a leftover from a previous edition.
Besides, the last statement in the section,
The DO instruction can also iterate over all of the values assigned to a stem variable.
should read "The DO and LOOP instructions...".
Anonymous
Uploading a patch that fixes this bug.