error[E0744]: `for` is not allowed in a `const`
  --> $DIR/issue-50582.rs:2:20
   |
LL |     Vec::<[(); 1 + for x in 0..1 {}]>::new();
   |                    ^^^^^^^^^^^^^^^^

error[E0277]: cannot add `()` to `{integer}`
  --> $DIR/issue-50582.rs:2:18
   |
LL |     Vec::<[(); 1 + for x in 0..1 {}]>::new();
   |                  ^ no implementation for `{integer} + ()`
   |
   = help: the trait `std::ops::Add<()>` is not implemented for `{integer}`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0744.
For more information about an error, try `rustc --explain E0277`.