Practical Uses
Although COMEFROM is syntactically and semantically valid, and capable of replacing GOTO in some programs, it is considerably more difficult to visualise in program design and actually implement in a programming language. The most well known use of a COMEFROM-like construct is setting a breakpoint during debugging. One implementation of FORTRAN included it, under the name "AT", as a debugging aid, with dire warnings against using it in production code. In addition, many modern CPUs have hardware support for breakpoints.
Some elements of aspect-oriented programming have been compared to the COMEFROM statement.
In some reversible computing assembly languages, the target of a GOTO is always a COMEFROM targeting the GOTO.
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