avoid applying in-place collect specialization in type-length test

the test was sized to match external iteration only, since
vec's in-place collect now uses internal iteration we collect into
a different type now.
Note that any other try-fold based operation such as count() would also
have exceeded the type length limit for that iterator.

Author: the8472

src/test/ui/iterators/issue-58952-filter-type-length.rs

@@ -3,6 +3,7 @@
 //! so check that we don't accidentially exceed the type length limit.
 // FIXME: Once the size of iterator adaptors is further reduced,
 // increase the complexity of this test.
+use std::collections::VecDeque;
 
 fn main() {
     let c = 2;
@@ -27,5 +28,5 @@ fn main() {
         .filter(|a| b.clone().any(|b| *b == *a))
         .filter(|a| b.clone().any(|b| *b == *a))
         .filter(|a| b.clone().any(|b| *b == *a))
-        .collect::<Vec<_>>();
+        .collect::<VecDeque<_>>();
 }