warning: function cannot return without recursing
  --> $DIR/issue-8727.rs:7:1
   |
LL | fn generic<T>() {
   | ^^^^^^^^^^^^^^^ cannot return without recursing
LL |     generic::<Option<T>>();
   |     ---------------------- recursive call site
   |
   = help: a `loop` may express intention better if this is on purpose
   = note: `#[warn(unconditional_recursion)]` on by default

error: reached the recursion limit while instantiating `generic::<Option<Option<Option<Option<Option<...>>>>>>`
  --> $DIR/issue-8727.rs:8:5
   |
LL |     generic::<Option<T>>();
   |     ^^^^^^^^^^^^^^^^^^^^^^
   |
note: `generic` defined here
  --> $DIR/issue-8727.rs:7:1
   |
LL | fn generic<T>() {
   | ^^^^^^^^^^^^^^^
   = note: the full type name has been written to '$TEST_BUILD_DIR/issues/issue-8727/issue-8727.long-type.txt'

error: aborting due to 1 previous error; 1 warning emitted