error: `derive` cannot be used on items with type macros
  --> $DIR/nonsense-input-to-debug.rs:7:22
   |
LL |     should_be_vec_t: vec![T],
   |                      ^^^^^^^

error: expected type, found `expr` metavariable
  --> $DIR/nonsense-input-to-debug.rs:7:22
   |
LL |     should_be_vec_t: vec![T],
   |                      ^^^^^^^
   |                      |
   |                      expected type
   |                      in this macro invocation
   |                      this macro call doesn't expand to a type
   |
   = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0392]: type parameter `T` is never used
  --> $DIR/nonsense-input-to-debug.rs:5:17
   |
LL | struct Nonsense<T> {
   |                 ^ unused type parameter
   |
   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0392`.