[hellerve]

defserver built main by calling eval on a (defn main …) form at expansion time. It was the macro's last expression, so the macro now returns that form instead, and the compiler defines main as it would any other expansion. Usage is unchanged.

The reason is portability: a compiler that expands macros ahead of time and keeps compile-time code apart from the program can't eval a static definition in the middle of expansion. On metacarp, defserver failed with unknown compile-time function: App.create. With this change it expands there. web still doesn't build on metacarp, because of an unrelated type-inference error in CacheControl.parse.

Tests. test/web.carp is 408/0 and test/websocket.carp is 155/0. The smoke test and gendocs pass.