Add some tests for fixed ICEs

src/test/ui/associated-item/issue-48027.rs

@@ -0,0 +1,8 @@
+trait Bar {
+    const X: usize;
+    fn return_n(&self) -> [u8; Bar::X]; //~ ERROR: type annotations needed
+}
+
+impl dyn Bar {} //~ ERROR: the trait `Bar` cannot be made into an object
+
+fn main() {}

src/test/ui/associated-item/issue-48027.stderr

@@ -0,0 +1,21 @@
+error[E0038]: the trait `Bar` cannot be made into an object
+  --> $DIR/issue-48027.rs:6:6
+   |
+LL |     const X: usize;
+   |           - the trait cannot contain associated consts like `X`
+...
+LL | impl dyn Bar {}
+   |      ^^^^^^^ the trait `Bar` cannot be made into an object
+
+error[E0283]: type annotations needed: cannot resolve `_: Bar`
+  --> $DIR/issue-48027.rs:3:32
+   |
+LL |     const X: usize;
+   |     --------------- required by `Bar::X`
+LL |     fn return_n(&self) -> [u8; Bar::X];
+   |                                ^^^^^^
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0038, E0283.
+For more information about an error, try `rustc --explain E0038`.

src/test/ui/associated-types/issue-44153.rs

@@ -0,0 +1,19 @@
+pub trait Array {
+    type Element;
+}
+
+pub trait Visit {
+    fn visit() {}
+}
+
+impl Array for () {
+    type Element = ();
+}
+
+impl<'a> Visit for () where
+    (): Array<Element=&'a ()>,
+{}
+
+fn main() {
+    <() as Visit>::visit(); //~ ERROR: type mismatch resolving
+}

src/test/ui/associated-types/issue-44153.stderr

@@ -0,0 +1,16 @@
+error[E0271]: type mismatch resolving `<() as Array>::Element == &()`
+  --> $DIR/issue-44153.rs:18:5
+   |
+LL |     fn visit() {}
+   |     ---------- required by `Visit::visit`
+...
+LL |     <() as Visit>::visit();
+   |     ^^^^^^^^^^^^^^^^^^^^ expected (), found &()
+   |
+   = note: expected type `()`
+              found type `&()`
+   = note: required because of the requirements on the impl of `Visit` for `()`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0271`.

src/test/ui/associated-types/issue-48010.rs

@@ -0,0 +1,23 @@
+// check-pass
+
+#![crate_type = "lib"]
+
+pub struct Foo;
+
+pub struct Path<T: Bar> {
+    _inner: T::Slice,
+}
+
+pub trait Bar: Sized {
+    type Slice: ?Sized;
+
+    fn open(_: &Path<Self>);
+}
+
+impl Bar for Foo {
+    type Slice = [u8];
+
+    fn open(_: &Path<Self>) {
+        unimplemented!()
+    }
+}

src/test/ui/issues/issue-47486.rs

@@ -0,0 +1,4 @@
+fn main() {
+    () < std::mem::size_of::<_>(); //~ ERROR: mismatched types
+    [0u8; std::mem::size_of::<_>()]; //~ ERROR: type annotations needed
+}

src/test/ui/issues/issue-47486.stderr

@@ -0,0 +1,19 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-47486.rs:2:10
+   |
+LL |     () < std::mem::size_of::<_>();
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^ expected (), found usize
+   |
+   = note: expected type `()`
+              found type `usize`
+
+error[E0282]: type annotations needed
+  --> $DIR/issue-47486.rs:3:11
+   |
+LL |     [0u8; std::mem::size_of::<_>()];
+   |           ^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0282, E0308.
+For more information about an error, try `rustc --explain E0282`.

src/test/ui/wf/issue-48638.rs

@@ -0,0 +1,21 @@
+// check-pass
+
+pub trait D {}
+pub struct DT;
+impl D for DT {}
+
+pub trait A<R: D>: Sized {
+    type AS;
+}
+
+pub struct As<R: D>(R);
+
+pub struct AT;
+impl<R: D> A<R> for AT {
+    type AS = As<R>;
+}
+
+#[repr(packed)]
+struct S(<AT as A<DT>>::AS);
+
+fn main() {}