History
COMEFROM was initially seen in lists of joke assembly language instructions (as 'CMFRM'). It was elaborated upon in a Datamation article by R. Lawrence Clark in 1973, written in response to Edsger Dijkstra's letter Go To Statement Considered Harmful. COMEFROM was eventually implemented in the C-INTERCAL variant of the esoteric programming language INTERCAL along with the even more obscure 'computed COMEFROM'. There were also Fortran proposals for 'assigned COME FROM' and a 'DONT' keyword (to complement the existing 'DO' loop).
On 1 April 2004, Richie Hindle published an implementation of both GOTO and COMEFROM for the Python programming language. Despite being released on April Fools' Day and not being intended for serious use, the syntax is valid and the implementation fully works.
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