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  Rust assumes a runtime, the standard library assumes a stack exists, a heap
  exists, and that main() is called by an OS;
Wrong.

Source: I'm writing Rust without a runtime without a heap and without a main function. You can too.



The Rust runtime will, at a minimum, set up the stack pointer, zero out the .bss, and fill in the .data section. You're right in that a heap is optional, but Rust will get very cranky if you don't set up the .data or .bss sections.


As will C.


No idea what either of you are talking about. It's the operating system that sets those things up not the language runtime.


Not for kernels.




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