![]() It sees simply a sequence of tokens to execute. This can be looked at as a single procedure call and its arguments, although it is better to keep in mind that the interpreter does not see it that way. Now let’s look at the procedure call itself, which requires three values to be on the operand stack. ![]() In this case, of course, if you tried to use the S procedure, it would tell you it was undefined, because it has no dictionary entry with S as the key. In particular, you don’t have to use a name as the key, and if you get things backwards, it won’t complain.
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