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netburst

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3MB of "hot" RAM, stored in a cryogenic flask - a cold boot attack. He isn't selling RAM, he's selling data.

Since you mention Go, it does offer precisely the feature you describe in the form of build constraints. A file starting with

  //go:build go1.18

tells the toolchain to use Go 1.18. A slightly different syntax was used prior to Go 1.17 but the feature itself has existed since Go 1.0.