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Re:Beating C with Dyalog APL by jarjarbinks455 on Thursday October 24, 2019 @04:16PM (#21348716)
Yes. Originally it was a thought experiment. Just like mathematicians can imagine an idea and use a notation without creating a compiler.
Re:Beating C with Dyalog APL by lispm on Thursday October 24, 2019 @04:28PM (#21348808)
Sure not. McCarthy wanted to develop a list processing system for the IBM 704 in the mid 50s. He experimented with Fortran and added list processing primitives and then went on to design and implement a new language: Lisp

McCarthy early on proposed to write a compiler - actually this was one of the very very early papers:

J. McCarthy. Memo to P. M. Morse: A Proposal for a compiler. Memo CC-56, Computation Center, Massachusetts Institute of Technology, December 13, 1957, 19 pages.

http://www.softwarepreservation.org/projects/LISP/MIT/CC-56....