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This is... beautiful.

I wonder though, how different are the file edited with ed and the one edited with vi. Maybe ed fails to update the "date modified" under these conditions?

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ed might do truncate/write, and vim might do create/write/rename. New file, cache miss.

Yeah, this is obviously a replace vs in-place modify difference. Could replace the script with a simple copy-to-temp+rename-back.

Or not use ed(1).

Personally I use magnets to flip bits around, ed(1) seems a bit to bloated for me.

Who needs magnets when you have cosmic rays?

Yeah I feel the right way to solve this bug (in the compiler) would be to stat the file. Or maybe docker mounts it with -noatime (or something similar?)

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