While exploring implementations of Pascal on BESM-6, I've encountered two peculiar language extensions about which I've asked on SE:
BRANCH/BACK: an analog of try/catch: https://retrocomputing.stackexchange.com/q/3150/4025 Structural labels as a way to implement generalized break/continue: https://retrocomputing.stackexchange.com/q/3296/4025 Both posts are quite verbose so I'm not quoting them here. Regarding the first feature, I was told in a private conversation that the message "exit on ALT" for an uncaught "exception" - the equivalent of C++ terminate() - might have its roots in MULTICS. Does any of the above ring any bells? I'm specifically interested in the branch/back feature. What theoretical paper does it come from? Thanks, Leo
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