module mod1 #flag -I @VMODROOT/mod1/c #flag @VMODROOT/mod1/c/implementation.o #include "header.h" pub struct C.MyStruct { UppercaseField int } fn C.cadd(i32, i32) i32 pub fn vadd(a int, b int) int { x := C.MyStruct{100} return 900 + x.UppercaseField + C.cadd(a, b) }