Some BASIC implementations that use LINE NUMBERS allow numeric expressions in GOTO and GOSUB statements:
- GOTO numeric-expression
- GOSUB numeric-expression
This is something BAM does not implement, and it would be messy to implement since BAM allows line labels as an alternative to line numbers, and some fancy checking would need to be done to distinguish line labels from num-expressions that consist of a variable.
As a workaround to simplify implementation, both GOTO and GOSUB now allow an "EVAL" clause to provide a numeric-expression for line numbers, or provide a string-expression for line labels.
This also provides the benefit of having a clear indicator of an expression being used.
Since it was ridiculously easy to implement, the EVAL clause was also added to the RESTORE statement.