error[E0308]: mismatched types
  --> $DIR/issue-42764.rs:11:43
   |
LL |     this_function_expects_a_double_option(n);
   |     ------------------------------------- ^ expected enum `DoubleOption`, found `usize`
   |     |
   |     arguments to this function are incorrect
   |
   = note: expected enum `DoubleOption<_>`
              found type `usize`
note: function defined here
  --> $DIR/issue-42764.rs:7:4
   |
LL | fn this_function_expects_a_double_option<T>(d: DoubleOption<T>) {}
   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    ------------------
help: try wrapping the expression in a variant of `DoubleOption`
   |
LL |     this_function_expects_a_double_option(DoubleOption::FirstSome(n));
   |                                           ++++++++++++++++++++++++ +
LL |     this_function_expects_a_double_option(DoubleOption::AlternativeSome(n));
   |                                           ++++++++++++++++++++++++++++++ +

error[E0308]: mismatched types
  --> $DIR/issue-42764.rs:27:33
   |
LL |     let _c = Context { wrapper: Payload{} };
   |                                 ^^^^^^^^^ expected struct `Wrapper`, found struct `Payload`
   |
help: try wrapping the expression in `Wrapper`
   |
LL |     let _c = Context { wrapper: Wrapper { payload: Payload{} } };
   |                                 ++++++++++++++++++           +

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.