error[E0320]: overflow while adding drop-check rules for `S<u32>`
  --> $DIR/issue-38591-non-regular-dropck-recursion.rs:12:6
   |
LL | fn f(x: S<u32>) {}
   |      ^
   |
   = note: overflowed on `S<fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(fn(...))))))))))))))))>`
   = note: the full name for the type has been written to '$TEST_BUILD_DIR/issue-38591-non-regular-dropck-recursion.long-type-$LONG_TYPE_HASH.txt'
   = note: consider using `--verbose` to print the full type name to the console

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0320`.