From bf766cd31bf045dfe7f37d4146f36aff001438ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Esteban=20K=C3=BCber?= <esteban@kuber.com.ar>
Date: Mon, 21 Aug 2023 19:59:27 +0000
Subject: [PATCH] Add test for #115019

---
 .../overlaping-bound-suggestion.rs            | 12 ++++++++
 .../overlaping-bound-suggestion.stderr        | 29 +++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs
 create mode 100644 tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr

diff --git a/tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs
new file mode 100644
index 00000000000..3853bc8594f
--- /dev/null
+++ b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.rs
@@ -0,0 +1,12 @@
+#![allow(bare_trait_objects)]
+#![feature(associated_type_bounds)]
+trait Item {
+    type Core;
+}
+pub struct Flatten<I> {
+    inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::Core,
+    //~^ ERROR E0191
+    //~| ERROR E0223
+}
+
+fn main() {}
diff --git a/tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr
new file mode 100644
index 00000000000..8bea440ddba
--- /dev/null
+++ b/tests/ui/associated-type-bounds/overlaping-bound-suggestion.stderr
@@ -0,0 +1,29 @@
+error[E0191]: the value of the associated types `IntoIter` (from trait `IntoIterator`), `IntoIter` (from trait `IntoIterator`), `Item` (from trait `IntoIterator`), `Item` (from trait `IntoIterator`) must be specified
+  --> $DIR/overlaping-bound-suggestion.rs:7:13
+   |
+LL |     inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::Core,
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |             |                  |
+   |             |                  associated types `Item`, `IntoIter` must be specified
+   |             associated types `Item`, `IntoIter` must be specified
+   |
+help: specify the associated types
+   |
+LL |     inner: <IntoIterator<Item: IntoIterator<Item: >, Item = Type, IntoIter = Type>IntoIterator<Item: , Item = Type, IntoIter = Type>>::IntoIterator as Item>::Core,
+   |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+error[E0223]: ambiguous associated type
+  --> $DIR/overlaping-bound-suggestion.rs:7:13
+   |
+LL |     inner: <IntoIterator<Item: IntoIterator<Item: >>::IntoIterator as Item>::Core,
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: if there were a trait named `Example` with associated type `IntoIterator` implemented for `(dyn IntoIterator + 'static)`, you could use the fully-qualified path
+   |
+LL |     inner: <<(dyn IntoIterator + 'static) as Example>::IntoIterator as Item>::Core,
+   |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0191, E0223.
+For more information about an error, try `rustc --explain E0191`.