error[E0433]: failed to resolve. Could not find `imp` in `sys`
  --> $DIR/issue-38857.rs:12:23
   |
LL |     let a = std::sys::imp::process::process_common::StdioPipes { ..panic!() };
   |                       ^^^ Could not find `imp` in `sys`

error[E0603]: module `sys` is private
  --> $DIR/issue-38857.rs:12:13
   |
LL |     let a = std::sys::imp::process::process_common::StdioPipes { ..panic!() };
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

Some errors occurred: E0433, E0603.
For more information about an error, try `rustc --explain E0433`.