Rollup merge of rust-lang#84379 - marmeladema:test-for-issue-79949, r…

…=jackh726

Add GAT related tests

Closes rust-lang#79949
Closes rust-lang#79636
Closes rust-lang#78671
Closes rust-lang#70303
Closes rust-lang#70304
Closes rust-lang#71176

src/test/ui/associated-type-bounds/issue-79949.rs

@@ -0,0 +1,26 @@
+// check-pass
+
+#![allow(incomplete_features)]
+#![feature(associated_type_bounds)]
+#![feature(generic_associated_types)]
+
+trait MP {
+    type T<'a>;
+}
+struct S(String);
+impl MP for S {
+    type T<'a> = &'a str;
+}
+
+trait SR: MP {
+    fn sr<IM>(&self) -> i32
+    where
+        for<'a> IM: T<T: U<<Self as MP>::T<'a>>>;
+}
+
+trait T {
+    type T;
+}
+trait U<X> {}
+
+fn main() {}

src/test/ui/generic-associated-types/issue-70303.rs

@@ -0,0 +1,60 @@
+// check-pass
+
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+trait Document {
+    type Cursor<'a>: DocCursor<'a>;
+
+    fn cursor(&self) -> Self::Cursor<'_>;
+}
+
+struct DocumentImpl {}
+
+impl Document for DocumentImpl {
+    type Cursor<'a> = DocCursorImpl<'a>;
+
+    fn cursor(&self) -> Self::Cursor<'_> {
+        DocCursorImpl {
+            document: &self,
+        }
+    }
+}
+
+
+trait DocCursor<'a> {}
+
+struct DocCursorImpl<'a> {
+    document: &'a DocumentImpl,
+}
+
+impl<'a> DocCursor<'a> for DocCursorImpl<'a> {}
+
+struct Lexer<'d, Cursor>
+where
+    Cursor: DocCursor<'d>,
+{
+    cursor: Cursor,
+    _phantom: std::marker::PhantomData<&'d ()>,
+}
+
+
+impl<'d, Cursor> Lexer<'d, Cursor>
+where
+    Cursor: DocCursor<'d>,
+{
+    pub fn from<Doc>(document: &'d Doc) -> Lexer<'d, Cursor>
+    where
+        Doc: Document<Cursor<'d> = Cursor>,
+    {
+        Lexer {
+            cursor: document.cursor(),
+            _phantom: std::marker::PhantomData,
+        }
+    }
+}
+
+pub fn main() {
+    let doc = DocumentImpl {};
+    let lexer: Lexer<'_, DocCursorImpl<'_>> = Lexer::from(&doc);
+}

src/test/ui/generic-associated-types/issue-70304.rs

@@ -0,0 +1,63 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+trait Document {
+    type Cursor<'a>: DocCursor<'a>;
+
+    fn cursor(&self) -> Self::Cursor<'_>;
+}
+
+struct DocumentImpl {}
+
+impl Document for DocumentImpl {
+    type Cursor<'a> = DocCursorImpl<'a>;
+
+    fn cursor(&self) -> Self::Cursor<'_> {
+        DocCursorImpl {
+            document: &self,
+        }
+    }
+}
+
+
+trait DocCursor<'a> {}
+
+struct DocCursorImpl<'a> {
+    document: &'a DocumentImpl,
+}
+
+impl<'a> DocCursor<'a> for DocCursorImpl<'a> {}
+
+struct Lexer<'d, Cursor>
+where
+    Cursor: DocCursor<'d>,
+{
+    cursor: Cursor,
+    _phantom: std::marker::PhantomData<&'d ()>,
+}
+
+
+impl<'d, Cursor> Lexer<'d, Cursor>
+where
+    Cursor: DocCursor<'d>,
+{
+    pub fn from<Doc>(document: &'d Doc) -> Lexer<'d, Cursor>
+    where
+        Doc: Document<Cursor<'d> = Cursor>,
+    {
+        Lexer {
+            cursor: document.cursor(),
+            _phantom: std::marker::PhantomData,
+        }
+    }
+}
+
+fn create_doc() -> impl Document<Cursor<'_> = DocCursorImpl<'_>> {
+                                       //~^ ERROR: missing lifetime specifier
+    DocumentImpl {}
+}
+
+pub fn main() {
+    let doc = create_doc();
+    let lexer: Lexer<'_, DocCursorImpl<'_>> = Lexer::from(&doc);
+}

src/test/ui/generic-associated-types/issue-70304.stderr

@@ -0,0 +1,15 @@
+error[E0106]: missing lifetime specifier
+  --> $DIR/issue-70304.rs:55:41
+   |
+LL | fn create_doc() -> impl Document<Cursor<'_> = DocCursorImpl<'_>> {
+   |                                         ^^ expected named lifetime parameter
+   |
+   = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
+help: consider using the `'static` lifetime
+   |
+LL | fn create_doc() -> impl Document<Cursor<'static> = DocCursorImpl<'_>> {
+   |                                         ^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0106`.

src/test/ui/generic-associated-types/issue-71176.rs

@@ -0,0 +1,21 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+trait Provider {
+    type A<'a>;
+      //~^ ERROR: missing generics for associated type
+}
+
+impl Provider for () {
+    type A<'a> = ();
+}
+
+struct Holder<B> {
+  inner: Box<dyn Provider<A = B>>,
+}
+
+fn main() {
+    Holder {
+        inner: Box::new(()),
+    };
+}

src/test/ui/generic-associated-types/issue-71176.stderr

@@ -0,0 +1,19 @@
+error[E0107]: missing generics for associated type `Provider::A`
+  --> $DIR/issue-71176.rs:5:10
+   |
+LL |     type A<'a>;
+   |          ^ expected 1 lifetime argument
+   |
+note: associated type defined here, with 1 lifetime parameter: `'a`
+  --> $DIR/issue-71176.rs:5:10
+   |
+LL |     type A<'a>;
+   |          ^ --
+help: use angle brackets to add missing lifetime argument
+   |
+LL |     type A<'a><'a>;
+   |           ^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0107`.

src/test/ui/generic-associated-types/issue-78671.rs

@@ -0,0 +1,14 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+trait CollectionFamily {
+    type Member<T>;
+         //~^ ERROR: missing generics for associated type
+}
+fn floatify() {
+    Box::new(Family) as &dyn CollectionFamily<Member=usize>
+}
+
+struct Family;
+
+fn main() {}

src/test/ui/generic-associated-types/issue-78671.stderr

@@ -0,0 +1,19 @@
+error[E0107]: missing generics for associated type `CollectionFamily::Member`
+  --> $DIR/issue-78671.rs:5:10
+   |
+LL |     type Member<T>;
+   |          ^^^^^^ expected 1 type argument
+   |
+note: associated type defined here, with 1 type parameter: `T`
+  --> $DIR/issue-78671.rs:5:10
+   |
+LL |     type Member<T>;
+   |          ^^^^^^ -
+help: use angle brackets to add missing type argument
+   |
+LL |     type Member<T><T>;
+   |                ^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0107`.

src/test/ui/generic-associated-types/issue-79636-1.rs

@@ -0,0 +1,24 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+trait Monad {
+    type Unwrapped;
+    type Wrapped<B>;
+         //~^ ERROR: missing generics for associated type `Monad::Wrapped`
+
+    fn bind<B, F>(self, f: F) -> Self::Wrapped<B> {
+        todo!()
+    }
+}
+
+fn join<MOuter, MInner, A>(outer: MOuter) -> MOuter::Wrapped<A>
+where
+    MOuter: Monad<Unwrapped = MInner>,
+    MInner: Monad<Unwrapped = A, Wrapped = MOuter::Wrapped<A>>,
+{
+    outer.bind(|inner| inner)
+}
+
+fn main() {
+    assert_eq!(join(Some(Some(true))), Some(true));
+}

src/test/ui/generic-associated-types/issue-79636-1.stderr

@@ -0,0 +1,19 @@
+error[E0107]: missing generics for associated type `Monad::Wrapped`
+  --> $DIR/issue-79636-1.rs:6:10
+   |
+LL |     type Wrapped<B>;
+   |          ^^^^^^^ expected 1 type argument
+   |
+note: associated type defined here, with 1 type parameter: `B`
+  --> $DIR/issue-79636-1.rs:6:10
+   |
+LL |     type Wrapped<B>;
+   |          ^^^^^^^ -
+help: use angle brackets to add missing type argument
+   |
+LL |     type Wrapped<B><B>;
+   |                 ^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0107`.

src/test/ui/generic-associated-types/issue-79636-2.rs

@@ -0,0 +1,18 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+trait SomeTrait {
+    type Wrapped<A>: SomeTrait;
+         //~^ ERROR: missing generics for associated type `SomeTrait::Wrapped`
+
+    fn f() -> ();
+}
+
+fn program<W>() -> ()
+where
+    W: SomeTrait<Wrapped = W>,
+{
+    return W::f();
+}
+
+fn main() {}

src/test/ui/generic-associated-types/issue-79636-2.stderr

@@ -0,0 +1,19 @@
+error[E0107]: missing generics for associated type `SomeTrait::Wrapped`
+  --> $DIR/issue-79636-2.rs:5:10
+   |
+LL |     type Wrapped<A>: SomeTrait;
+   |          ^^^^^^^ expected 1 type argument
+   |
+note: associated type defined here, with 1 type parameter: `A`
+  --> $DIR/issue-79636-2.rs:5:10
+   |
+LL |     type Wrapped<A>: SomeTrait;
+   |          ^^^^^^^ -
+help: use angle brackets to add missing type argument
+   |
+LL |     type Wrapped<A><A>: SomeTrait;
+   |                 ^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0107`.