Add some ICEs (#652)

Author: fanninpm

ices/80351.rs

@@ -0,0 +1,19 @@
+fn main() {
+    enqueue::<(), _>(|_result| {});
+}
+
+trait Query<'a> {
+    type Result: 'a;
+    fn execute() -> Self::Result;
+}
+
+impl<'a> Query<'a> for () {
+    type Result = ();
+    fn execute() -> () {
+        ()
+    }
+}
+
+fn enqueue<Q: for<'q> Query<'q>, F: 'static + for<'r> FnOnce(<Q as Query<'r>>::Result)>(f: F) {
+    let _: Box<dyn FnOnce()> = Box::new(move || f(Q::execute()));
+}

ices/81199.rs

@@ -0,0 +1,9 @@
+union PtrRepr<T: ?Sized> {
+    const_ptr: *const T,
+    mut_ptr: *mut T,
+    components: <T as Pointee>::Metadata
+}
+
+pub trait Pointee {
+    type Metadata;
+}

ices/81786.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+cat > out.rs <<'EOF'
+#![feature(auto_traits, negative_impls)]
+
+auto trait AutoTrait {}
+
+pub struct Struct<K, V> {
+    k: K,
+    v: V
+}
+
+impl<T> !AutoTrait for *const T {}
+
+impl<K, V> AutoTrait for Struct<K, V>
+where
+    K: AutoTrait,
+    V: AutoTrait,
+{
+}
+
+impl AutoTrait for Struct<usize, *const usize> {}
+
+pub struct Wrap<'a> {
+    inner: &'a Struct<usize, *const usize>,
+}
+
+fn main() {}
+EOF
+
+rustdoc out.rs --output-format json

ices/81809.rs

@@ -0,0 +1,74 @@
+use std::ops::Index;
+
+pub trait Indexable {
+    type Index;
+}
+struct Foo;
+struct Bar;
+impl Indexable for Foo { type Index = u8; }
+impl Indexable for Bar { type Index = u16; }
+
+pub trait Indexer<T: Indexable>: Index<T::Index, Output=T> {}
+
+struct Store;
+
+impl Index<u8> for Store {
+    type Output = Foo;
+    fn index(&self, _: u8) -> &Foo { panic!() }
+}
+impl Index<u16> for Store {
+    type Output = Bar;
+    fn index(&self, _: u16) -> &Bar { panic!() }
+}
+impl Indexer<Foo> for Store { }
+impl Indexer<Bar> for Store { }
+
+// implies StoreIndex: Index<u8, Output=Foo> + Index<u16, Output=Bar>
+trait StoreIndex: Indexer<Foo> + Indexer<Bar> {}
+
+impl StoreIndex for Store {}
+
+struct Collection {
+    stores: Vec<Store>,
+}
+
+trait StoreCollection {
+    fn get_store(&self, _: usize) -> Option<&dyn StoreIndex>;
+}
+
+impl StoreCollection for Collection {
+    //  Fails to compile:
+    //    expected:
+    //      Option<&dyn StoreIndex<Output = Bar, Output = Foo>
+    //    found:
+    //      Option<&Store>
+    /*
+    fn get_store(&self, i: usize) -> Option<&dyn StoreIndex> {
+        self.stores.get(i)
+    }
+    */
+
+    // ICE
+    fn get_store(&self, i: usize) -> Option<&dyn StoreIndex> {
+        if let Some(s) = self.stores.get(i) {
+            Some(s as &dyn StoreIndex)
+        } else {
+            None
+        }
+    }
+
+    // However, if the above is removed in favor of Indexing
+    // type checking succeeds and the type of `&self.stores[i]`
+    // is properly inferred
+    /*
+    fn get_store(&self, i: usize) -> Option<&dyn StoreIndex> {
+        if i < self.stores.len() {
+            Some(&self.stores[i])
+        } else {
+            None
+        }
+    }
+    */
+}
+
+fn main() {}

ices/81899.rs

@@ -0,0 +1,10 @@
+const _CONST: &[u8] = &f(&[], |_| {});
+
+const fn f<F>(_: &[u8], _: F) -> &[u8]
+where
+    F: FnMut(&u8),
+{
+    panic!()
+}
+
+fn main() {}

ices/81924.rs

@@ -0,0 +1 @@
+#![a = {enum b {