https://issues.dlang.org/show_bug.cgi?id=17454
--- Comment #2 from Walter Bright <bugzi...@digitalmars.com> --- > d_fun returns a struct by value which appears by looking at the disassembly > that d_fun allocates room for the result value on it's stack, and then > returns a pointer to the result in RAX. D never does that, because then d_fun() would be returning a pointer into its own stack, which has expired and hence is a big no-no. What does happen is d_fun()'s caller allocates S, and then passes a pointer to S to d_fun(), and d_fun() fills it in and returns that pointer to S. But if S fits in a register, this does not happen, as the disassembly shows. --
