574: Mainline

Now, you can use Smalltalk Express's hop, skip, and jump buttons to move the evaluation along. The hop button causes the least evaluation; the skip button causes a little more:

• When you press hop, the debugger continues to the next receiver–message combination.
• When you press skip, the debugger continues to the next receiver–message combination shown in the lower window. The debugger skips receiver–message combinations that occur inside called methods.