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namespace;
include rt;
// a borrows clause on a prototype and its definition: freeing the other argument keeps the result.
char* first(char* a, char* b) borrows a;
fn main() {
char* t = rt.new(4); t[0] = 'x'; t[1] = 0;
char* u = rt.new(4); u[0] = 'y'; u[1] = 0;
let r = first(t, u); rt.free(u); rt.put_c(r[0]); rt.free(t);
return 0;
}
char* first(char* a, char* b) borrows a { return a; }
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