1 files changed, 46 insertions, 0 deletions
diff --git a/tests/ui/higher-ranked/trait-bounds/issue-30786.stderr b/tests/ui/higher-ranked/trait-bounds/issue-30786.stderr
new file mode 100644
index 000000000..f32ba5720
--- /dev/null
+++ b/tests/ui/higher-ranked/trait-bounds/issue-30786.stderr
@@ -0,0 +1,46 @@
+error[E0599]: the method `filterx` exists for struct `Map<Repeat, [closure@issue-30786.rs:119:27]>`, but its trait bounds were not satisfied
+  --> $DIR/issue-30786.rs:120:22
+   |
+LL | pub struct Map<S, F> {
+   | --------------------
+   | |
+   | method `filterx` not found for this struct
+   | doesn't satisfy `_: StreamExt`
+...
+LL |     let filter = map.filterx(|x: &_| true);
+   |                      ^^^^^^^ method cannot be called on `Map<Repeat, [closure@issue-30786.rs:119:27]>` due to unsatisfied trait bounds
+   |
+note: the following trait bounds were not satisfied:
+      `&'a mut &Map<Repeat, [closure@$DIR/issue-30786.rs:119:27: 119:34]>: Stream`
+      `&'a mut &mut Map<Repeat, [closure@$DIR/issue-30786.rs:119:27: 119:34]>: Stream`
+      `&'a mut Map<Repeat, [closure@$DIR/issue-30786.rs:119:27: 119:34]>: Stream`
+  --> $DIR/issue-30786.rs:98:50
+   |
+LL | impl<T> StreamExt for T where for<'a> &'a mut T: Stream {}
+   |         ---------     -                          ^^^^^^ unsatisfied trait bound introduced here
+
+error[E0599]: the method `countx` exists for struct `Filter<Map<Repeat, fn(&u64) -> &u64 {identity::<u64>}>, [closure@issue-30786.rs:131:30]>`, but its trait bounds were not satisfied
+  --> $DIR/issue-30786.rs:132:24
+   |
+LL | pub struct Filter<S, F> {
+   | -----------------------
+   | |
+   | method `countx` not found for this struct
+   | doesn't satisfy `_: StreamExt`
+...
+LL |     let count = filter.countx();
+   |                        ^^^^^^ method cannot be called due to unsatisfied trait bounds
+   |
+   = note: the full type name has been written to '$TEST_BUILD_DIR/higher-ranked/trait-bounds/issue-30786/issue-30786.long-type-hash.txt'
+note: the following trait bounds were not satisfied:
+      `&'a mut &Filter<Map<Repeat, for<'a> fn(&'a u64) -> &'a u64 {identity::<u64>}>, [closure@$DIR/issue-30786.rs:131:30: 131:37]>: Stream`
+      `&'a mut &mut Filter<Map<Repeat, for<'a> fn(&'a u64) -> &'a u64 {identity::<u64>}>, [closure@$DIR/issue-30786.rs:131:30: 131:37]>: Stream`
+      `&'a mut Filter<Map<Repeat, for<'a> fn(&'a u64) -> &'a u64 {identity::<u64>}>, [closure@$DIR/issue-30786.rs:131:30: 131:37]>: Stream`
+  --> $DIR/issue-30786.rs:98:50
+   |
+LL | impl<T> StreamExt for T where for<'a> &'a mut T: Stream {}
+   |         ---------     -                          ^^^^^^ unsatisfied trait bound introduced here
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0599`.