ATARI BASIC. Interpreter is the IDE. You turn off the computer and your code is gone, unless you saved it to tape.
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VBA for Access. Alt-F11 to reveal that a full IDE is an Easter egg in MS-Office, accidentally giving dev tools to everyone.
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Visual Studio & now Jebrains products https://x.com/cassidoo/status/1371008784659849217
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March 14, 2021