error[E0493]: destructor of `(Foo, Foo)` cannot be evaluated at compile-time --> $DIR/E0493.rs:17:17 | LL | const F : Foo = (Foo { a : 0 }, Foo { a : 1 }).1; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - value is dropped here | | | the destructor for this type cannot be evaluated in constants error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0493`.