Problems with debug step command on untilTrue:/untilFalse:
The GemStone debugging step operator, used from either the GBS debugger
or the topaz step command, exhibits various problems when stepping though
untilTrue:/untilFalse: statements and their associated blocks.
In some cases, the debugger gets stuck on the untilTrue:/untilFalse:
statement. Repeated uses of the step command will not advance the program
counter beyond the untilTrue:/untilFalse: statement.
In other cases, spurious execution errors are triggered by statements
within the block.
Use breakpoints and "continue" from one breakpoint to the next, rather
than stepping through the code.