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@bagder Some of us learn slowly.

This realization was triggered a "workflow tool" for a programming language where running a program builds it before running it, but doesn't actually write the built binary to a file. Building the program does that.

Foot gun: if one has built the binary earlier and has a binary lying around, running the program with the workflow tool doesn't update the binary. Result: head-scratching when running the binary directly gives different results.