error[E0599]: no method named `unassign` found for struct `Function<U0_RXD, Unassigned>` in the current scope
  --> $DIR/unassign-unassigned-input-function.rs:33:16
   |
33 |         u0_rxd.unassign(pio0_0, &mut swm_handle);
   |                ^^^^^^^^ help: there is an associated function with a similar name: `assign`