What is the smallest MIR output that I can create using the c api?

[rishavs]

I am trying to smoke test the c api in my toy compiler and wanted to know what is the smallest MIR program I can generate which I can test against.
Something like this in c

#include <stdio.h>
int main() {
    return 0;
}

I just want to know the I have integrated MIR properly.

[vnmakarov]

You can use int main () {return 0;} and compile it by c2m with option -S. It will produce .mir file you can use for your purposes:

M0:     module
main:   func    i32

# 0 args, 0 locals, 0 globals
	ret     0
	endfunc
	export  main
	endmodule