From e802165dfe346e92a3ef9b0e49634943df862a67 Mon Sep 17 00:00:00 2001
From: Esteban Küber <esteban@kuber.com.ar>
Date: Mon, 28 Nov 2022 00:03:57 -0800
Subject: On E0195 point at where clause lifetime bounds

Fix #104733
---
 ...pl-missing-where-clause-lifetimes-from-trait.rs | 30 ++++++++++++++++++++++
 ...issing-where-clause-lifetimes-from-trait.stderr | 27 +++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.rs
 create mode 100644 src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.stderr

(limited to 'src/test')

diff --git a/src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.rs b/src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.rs
new file mode 100644
index 00000000000..1994120ce14
--- /dev/null
+++ b/src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.rs
@@ -0,0 +1,30 @@
+trait Trait<T> {
+    fn foo<'a, K>(self, _: T, _: K) where T: 'a, K: 'a;
+}
+
+impl Trait<()> for () {
+    fn foo<'a, K>(self, _: (), _: K) where { //~ ERROR E0195
+        todo!();
+    }
+}
+
+struct State;
+
+trait Foo<T> {
+    fn foo<'a>(&self, state: &'a State) -> &'a T
+    where
+        T: 'a;
+}
+
+impl<F, T> Foo<T> for F
+where
+    F: Fn(&State) -> &T,
+{
+    fn foo<'a>(&self, state: &'a State) -> &'a T { //~ ERROR E0195
+        self(state)
+    }
+}
+
+fn main() {
+    ().foo((), ());
+}
diff --git a/src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.stderr b/src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.stderr
new file mode 100644
index 00000000000..3a02369e2ee
--- /dev/null
+++ b/src/test/ui/trait-bounds/impl-missing-where-clause-lifetimes-from-trait.stderr
@@ -0,0 +1,27 @@
+error[E0195]: lifetime parameters or bounds on method `foo` do not match the trait declaration
+  --> $DIR/impl-missing-where-clause-lifetimes-from-trait.rs:6:11
+   |
+LL |     fn foo<'a, K>(self, _: T, _: K) where T: 'a, K: 'a;
+   |           -------                            --     -- this bound might be missing in the impl
+   |           |                                  |
+   |           |                                  this bound might be missing in the impl
+   |           lifetimes in impl do not match this method in trait
+...
+LL |     fn foo<'a, K>(self, _: (), _: K) where {
+   |           ^^^^^^^ lifetimes do not match method in trait
+
+error[E0195]: lifetime parameters or bounds on method `foo` do not match the trait declaration
+  --> $DIR/impl-missing-where-clause-lifetimes-from-trait.rs:23:11
+   |
+LL |     fn foo<'a>(&self, state: &'a State) -> &'a T
+   |           ---- lifetimes in impl do not match this method in trait
+LL |     where
+LL |         T: 'a;
+   |            -- this bound might be missing in the impl
+...
+LL |     fn foo<'a>(&self, state: &'a State) -> &'a T {
+   |           ^^^^ lifetimes do not match method in trait
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0195`.
-- 
cgit 1.4.1-3-g733a5