Add tests to fixed ICEs

Closes #27078. Closes #27985. Closes #39848. Closes #42164.
Closes #42479. Closes #45152. Closes #45662. Closes #45876.
Closes #45965.

src/test/run-pass/align-with-extern-c-fn.rs

@@ -0,0 +1,23 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// #45662
+
+#![feature(repr_align)]
+#![feature(attr_literals)]
+
+#[repr(align(16))]
+pub struct A {
+    y: i64,
+}
+
+pub extern "C" fn foo(x: A) {}
+
+fn main() {}

src/test/run-pass/impl-trait/issue-42479.rs

@@ -0,0 +1,27 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(conservative_impl_trait)]
+
+use std::iter::once;
+
+struct Foo {
+    x: i32,
+}
+
+impl Foo {
+    fn inside(&self) -> impl Iterator<Item = &i32> {
+        once(&self.x)
+    }
+}
+
+fn main() {
+    println!("hi");
+}

src/test/run-pass/issue-45152.rs

@@ -0,0 +1,31 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(unsize, coerce_unsized)]
+
+#[repr(packed)]
+struct UnalignedPtr<'a, T: ?Sized>
+    where T: 'a,
+{
+    data: &'a T,
+}
+
+fn main() {
+
+    impl<'a, T, U> std::ops::CoerceUnsized<UnalignedPtr<'a, U>> for UnalignedPtr<'a, T>
+        where
+        T: std::marker::Unsize<U> + ?Sized,
+        U: ?Sized,
+    { }
+
+    let arr = [1, 2, 3];
+    let arr_unaligned: UnalignedPtr<[i32; 3]> = UnalignedPtr { data: &arr };
+    let arr_unaligned: UnalignedPtr<[i32]> = arr_unaligned;
+}

src/test/run-pass/macro-nested_expr.rs

@@ -0,0 +1,32 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// #42164
+
+#![feature(decl_macro)]
+#![allow(dead_code)]
+
+pub macro m($inner_str:expr) {
+    #[doc = $inner_str]
+    struct S;
+}
+
+macro_rules! define_f {
+    ($name:expr) => {
+        #[export_name = $name]
+        fn f() {}
+    }
+}
+
+fn main() {
+    define_f!(concat!("exported_", "f"));
+    m!(stringify!(foo));
+}
+