diff --git a/src/libcoretest/option.rs b/src/libcoretest/option.rs
index 195ed054c182f..66945ad251f1e 100644
--- a/src/libcoretest/option.rs
+++ b/src/libcoretest/option.rs
@@ -219,7 +219,6 @@ fn test_ord() {
     assert!(big > None);
 }
 
-/* FIXME(#20575)
 #[test]
 fn test_collect() {
     let v: Option<Vec<isize>> = (0..0).map(|_| Some(0)).collect();
@@ -241,7 +240,7 @@ fn test_collect() {
 
     assert!(v == None);
 }
-*/
+
 
 #[test]
 fn test_cloned() {
diff --git a/src/libcoretest/result.rs b/src/libcoretest/result.rs
index 9a682d8bd1157..3fdb102875332 100644
--- a/src/libcoretest/result.rs
+++ b/src/libcoretest/result.rs
@@ -65,7 +65,6 @@ fn test_impl_map_err() {
     assert!(Err::<isize, isize>(1).map_err(|x| x + 1) == Err(2));
 }
 
-/* FIXME(#20575)
 #[test]
 fn test_collect() {
     let v: Result<Vec<isize>, ()> = (0..0).map(|_| Ok::<isize, ()>(0)).collect();
@@ -86,7 +85,6 @@ fn test_collect() {
     let v: Result<Vec<()>, isize> = functions.iter_mut().map(|f| (*f)()).collect();
     assert!(v == Err(1));
 }
-*/
 
 #[test]
 fn test_fmt_default() {