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1 point by aw 5202 days ago | link | parent

The pattern (comma quote comma)

  ,',X
turns out to be common in nested quasiquotation expressions, such as when you have macros defining macros.

See http://repository.readscheme.org/ftp/papers/pepm99/bawden.pd... for a description:

"The value of X will appear as a constant in the intermediate quasiquotation and will thus appear unchanged in the final result."