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perf: Key the interpreter symbol cache by Name rather than FastString
[ghc.git] / m4 / fp_copy_shellvar.m4
blobf58601a3f1a1c5539f0d54ed730e81af43072f9d
1 # Helper for cloning a shell variable's state
2 AC_DEFUN([FP_COPY_SHELLVAR],
3 [if test -n "${$1+set}"; then $2="$$1"; else unset $2; fi ])
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