error: Deref cannot be derived for unit structs. It is only applicable to structs with at least one field.
 --> tests/inc/deref/struct_unit.rs:4:1
  |
4 | / #[ allow( dead_code ) ]
5 | | #[ derive ( Deref ) ]
6 | | struct StructUnit;
  | |__________________^

warning: unused import: `core::ops::Deref`
 --> tests/inc/deref/struct_unit.rs:1:5
  |
1 | use core::ops::Deref;
  |     ^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0601]: `main` function not found in crate `$CRATE`
 --> tests/inc/deref/struct_unit.rs:8:42
  |
8 | include!( "./only_test/struct_unit.rs" );
  |                                          ^ consider adding a `main` function to `$DIR/tests/inc/deref/struct_unit.rs`
