Auto merge of #109801 - aliemjay:test-implied-normalization, r=petrochenkov

add test for normalization in implied bounds query

See #109799.

Author: bors

tests/ui/implied-bounds/normalization-nested.lifetime.stderr

@@ -0,0 +1,18 @@
+error[E0759]: `fn` parameter has lifetime `'x` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/normalization-nested.rs:35:20
+   |
+LL | pub fn test<'x>(_: Map<Vec<&'x ()>>, s: &'x str) -> &'static str {
+   |                    ^^^^^^^^^^^^^^^^
+   |                    |
+   |                    this data with lifetime `'x`...
+   |                    ...is used and required to live as long as `'static` here
+   |
+note: `'static` lifetime requirement introduced by this bound
+  --> $DIR/normalization-nested.rs:33:14
+   |
+LL |     I::Item: 'static;
+   |              ^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0759`.

tests/ui/implied-bounds/normalization-nested.rs

@@ -0,0 +1,39 @@
+// Test for normalization of projections that appear in the item bounds
+// (versus those that appear directly in the input types).
+// Both revisions should pass. `lifetime` revision is a bug.
+//
+// revisions: param_ty lifetime
+// [param_ty] check-pass
+// [lifetime] check-fail
+// [lifetime] known-bug: #109799
+
+pub trait Iter {
+    type Item;
+}
+
+#[cfg(param_ty)]
+impl<X, I> Iter for I
+where
+    I: IntoIterator<Item = X>,
+{
+    type Item = X;
+}
+
+#[cfg(lifetime)]
+impl<'x, I> Iter for I
+where
+    I: IntoIterator<Item = &'x ()>,
+{
+    type Item = &'x ();
+}
+
+pub struct Map<I>(I)
+where
+    I: Iter,
+    I::Item: 'static;
+
+pub fn test<'x>(_: Map<Vec<&'x ()>>, s: &'x str) -> &'static str {
+    s
+}
+
+fn main() {}