From 5ee4d13709c6de71c206529563e2736cd6ac0033 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Le=C3=B3n=20Orell=20Valerian=20Liehr?= <me@fmease.dev>
Date: Tue, 2 Apr 2024 18:37:01 +0200
Subject: [PATCH] rustdoc: add a couple of regression tests

---
 .../const-in-super-trait-and-item-bound.rs    | 23 +++++++++++++++++
 ...ctions-in-super-trait-bound-unsatisfied.rs | 18 +++++++++++++
 ...ns-in-super-trait-bound-unsatisfied.stderr | 25 +++++++++++++++++++
 .../unconstrained-param-in-impl-ambiguity.rs  | 10 ++++++++
 ...constrained-param-in-impl-ambiguity.stderr |  9 +++++++
 5 files changed, 85 insertions(+)
 create mode 100644 tests/rustdoc-ui/synthetic-auto-trait-impls/const-in-super-trait-and-item-bound.rs
 create mode 100644 tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.rs
 create mode 100644 tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.stderr
 create mode 100644 tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.rs
 create mode 100644 tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.stderr

diff --git a/tests/rustdoc-ui/synthetic-auto-trait-impls/const-in-super-trait-and-item-bound.rs b/tests/rustdoc-ui/synthetic-auto-trait-impls/const-in-super-trait-and-item-bound.rs
new file mode 100644
index 0000000000000..df6de6769d57f
--- /dev/null
+++ b/tests/rustdoc-ui/synthetic-auto-trait-impls/const-in-super-trait-and-item-bound.rs
@@ -0,0 +1,23 @@
+// We used to ICE here while trying to synthesize auto trait impls.
+// issue: 107715
+//@ check-pass
+
+pub const N: usize = 1;
+
+pub struct MapType<K: Supertrait<V>, V> {
+    _array: K::Array,
+}
+
+pub trait Subtrait: Supertrait<[u8; N]> {}
+
+pub trait Supertrait<V> {
+    type Array: AnotherTrait<V>;
+}
+
+pub trait AnotherTrait<V> {
+    const LENGTH: usize;
+}
+
+pub struct Container<S: Subtrait> {
+    _x: MapType<S, [u8; N]>,
+}
diff --git a/tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.rs b/tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.rs
new file mode 100644
index 0000000000000..f62f8396e9911
--- /dev/null
+++ b/tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.rs
@@ -0,0 +1,18 @@
+// We used to ICE here while trying to synthesize auto trait impls.
+// issue: 114657
+
+pub trait Foo {
+    type FooType;
+}
+
+pub trait Bar<const A: usize>: Foo<FooType = <Self as Bar<A>>::BarType> {
+    type BarType;
+}
+
+pub(crate) const B: usize = 5;
+
+pub trait Tec: Bar<B> {}
+
+pub struct Structure<C: Tec> { //~ ERROR the trait bound `C: Bar<5>` is not satisfied
+    _field: C::BarType, //~ ERROR the trait bound `C: Bar<5>` is not satisfied
+}
diff --git a/tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.stderr b/tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.stderr
new file mode 100644
index 0000000000000..d87e769b50538
--- /dev/null
+++ b/tests/rustdoc-ui/synthetic-auto-trait-impls/projections-in-super-trait-bound-unsatisfied.stderr
@@ -0,0 +1,25 @@
+error[E0277]: the trait bound `C: Bar<5>` is not satisfied
+  --> $DIR/projections-in-super-trait-bound-unsatisfied.rs:16:1
+   |
+LL | pub struct Structure<C: Tec> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Bar<5>` is not implemented for `C`
+   |
+help: consider further restricting this bound
+   |
+LL | pub struct Structure<C: Tec + Bar<5>> {
+   |                             ++++++++
+
+error[E0277]: the trait bound `C: Bar<5>` is not satisfied
+  --> $DIR/projections-in-super-trait-bound-unsatisfied.rs:17:13
+   |
+LL |     _field: C::BarType,
+   |             ^^^^^^^^^^ the trait `Bar<5>` is not implemented for `C`
+   |
+help: consider further restricting this bound
+   |
+LL | pub struct Structure<C: Tec + Bar<5>> {
+   |                             ++++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.rs b/tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.rs
new file mode 100644
index 0000000000000..6c62415e06d56
--- /dev/null
+++ b/tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.rs
@@ -0,0 +1,10 @@
+// We used to ICE here while trying to synthesize auto trait impls.
+// issue: 112828
+
+struct Outer(Inner);
+struct Inner;
+
+unsafe impl<Q: Trait> Send for Inner {}
+//~^ ERROR the type parameter `Q` is not constrained by the impl trait, self type, or predicates
+
+trait Trait {}
diff --git a/tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.stderr b/tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.stderr
new file mode 100644
index 0000000000000..38d1a537fe458
--- /dev/null
+++ b/tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.stderr
@@ -0,0 +1,9 @@
+error[E0207]: the type parameter `Q` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/unconstrained-param-in-impl-ambiguity.rs:7:13
+   |
+LL | unsafe impl<Q: Trait> Send for Inner {}
+   |             ^ unconstrained type parameter
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0207`.