Re: catch and throw, was Is multi-level function return possible?

Bakul Shah <usenet@bitblocks.com>
Wed, 26 Mar 2014 23:20:26 -0700

          From comp.compilers
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From: Bakul Shah <usenet@bitblocks.com>
Newsgroups: comp.compilers
Date: Wed, 26 Mar 2014 23:20:26 -0700
Organization: Sonic.Net
References: 14-03-020 14-03-023 14-03-065 14-03-068
Keywords: errors, history
Posted-Date: 27 Mar 2014 14:55:03 EDT

On 3/26/14, 9:23 PM, Rob Warnock wrote:
> According to Gabriel and Steele in "The Evolution of Lisp"[1],
> Lisp 1.5 [early 1960s] had (ERRSET form), ...


PL/I had ON and SIGNAL statements. SIGNAL would signal an exception.
ON would catch it. REVERT to cancel the effect of ON. Web search
indicates it was defined in 1964 but implemented later. May be the
PL/I designered borrowed it from an earlier language/facility?

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