Rollup merge of rust-lang#67543 - JohnTitor:regression-tests, r=Dylan-DPC

Add regression tests for fixed ICEs

Closes rust-lang#61747 (fixed from 1.41.0-nightly (4007d4e 2019-12-01))
Closes rust-lang#66205 (fixed from 1.41.0-nightly (4007d4e 2019-12-01))
Closes rust-lang#66270 (fixed by rust-lang#66246)
Closes rust-lang#66868 (fixed by rust-lang#67071)
Closes rust-lang#67424 (fixed by rust-lang#67160)

Also picking a minor nit up from rust-lang#67071 with 101dd7b

r? @Centril

Author: Centril

src/librustc/traits/error_reporting.rs

@@ -2373,7 +2373,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         let span = self.tcx.def_span(generator_did);
 
         // Do not ICE on closure typeck (#66868).
-        if let None = self.tcx.hir().as_local_hir_id(generator_did) {
+        if self.tcx.hir().as_local_hir_id(generator_did).is_none() {
             return false;
         }
 

src/test/ui/const-generics/issues/issue-61747.rs

@@ -0,0 +1,16 @@
+// check-pass
+
+#![feature(const_generics)]
+//~^ WARN the feature `const_generics` is incomplete and may cause the compiler to crash
+
+struct Const<const N: usize>;
+
+impl<const C: usize> Const<{C}> {
+    fn successor() -> Const<{C + 1}> {
+        Const
+    }
+}
+
+fn main() {
+    let _x: Const::<2> = Const::<1>::successor();
+}

src/test/ui/const-generics/issues/issue-61747.stderr

@@ -0,0 +1,8 @@
+warning: the feature `const_generics` is incomplete and may cause the compiler to crash
+  --> $DIR/issue-61747.rs:3:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+

src/test/ui/const-generics/issues/issue-66205.rs

@@ -0,0 +1,10 @@
+// check-pass
+
+#![allow(incomplete_features, dead_code, unconditional_recursion)]
+#![feature(const_generics)]
+
+fn fact<const N: usize>() {
+    fact::<{ N - 1 }>();
+}
+
+fn main() {}

src/test/ui/generic-associated-types/issue-67424.rs

@@ -0,0 +1,13 @@
+// Fixed by #67160
+
+trait Trait1 {
+    type A;
+}
+
+trait Trait2 {
+    type Type1<B>: Trait1<A=B>;
+    //~^ ERROR: generic associated types are unstable
+    //~| ERROR: type-generic associated types are not yet implemented
+}
+
+fn main() {}

src/test/ui/generic-associated-types/issue-67424.stderr

@@ -0,0 +1,20 @@
+error[E0658]: generic associated types are unstable
+  --> $DIR/issue-67424.rs:8:5
+   |
+LL |     type Type1<B>: Trait1<A=B>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, see https://github.com/rust-lang/rust/issues/44265
+   = help: add `#![feature(generic_associated_types)]` to the crate attributes to enable
+
+error: type-generic associated types are not yet implemented
+  --> $DIR/issue-67424.rs:8:5
+   |
+LL |     type Type1<B>: Trait1<A=B>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, see https://github.com/rust-lang/rust/issues/44265
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0658`.

src/test/ui/pattern/issue-66270-pat-struct-parser-recovery.rs

@@ -0,0 +1,14 @@
+// Regression test for #66270, fixed by #66246
+
+struct Bug {
+    incorrect_field: 0,
+    //~^ ERROR expected type
+}
+
+struct Empty {}
+
+fn main() {
+    let Bug {
+        any_field: Empty {},
+    } = Bug {};
+}

src/test/ui/pattern/issue-66270-pat-struct-parser-recovery.stderr

@@ -0,0 +1,8 @@
+error: expected type, found `0`
+  --> $DIR/issue-66270-pat-struct-parser-recovery.rs:4:22
+   |
+LL |     incorrect_field: 0,
+   |                      ^ expected type
+
+error: aborting due to previous error
+

src/test/ui/typeck/auxiliary/issue_66868_closure_typeck.rs

@@ -0,0 +1,25 @@
+// edition:2018
+
+#![crate_type = "lib"]
+
+use std::{
+    future::Future,
+    pin::Pin,
+    sync::RwLock,
+    task::{Context, Poll},
+};
+
+struct S {}
+
+impl Future for S {
+    type Output = ();
+    fn poll(self: Pin<&mut Self>, _: &mut Context) -> Poll<Self::Output> {
+        Poll::Pending
+    }
+}
+
+pub async fn f() {
+    let fo = RwLock::new(S {});
+
+    (&mut *fo.write().unwrap()).await;
+}

src/test/ui/typeck/issue-66868-closure-typeck.rs

@@ -0,0 +1,15 @@
+// Fixed by #67071
+// aux-build: issue_66868_closure_typeck.rs
+// edition:2018
+
+extern crate issue_66868_closure_typeck;
+
+pub fn g<T>(task: T)
+where
+    T: Send,
+{
+}
+
+fn main() {
+    g(issue_66868_closure_typeck::f()); //~ ERROR: cannot be sent between threads safely
+}