Implement simple codegen for unsized rvalues.

1 files changed, 65 insertions, 0 deletions

diff --git a/src/test/run-pass-valgrind/unsized-locals/long-live-the-unsized-temporary.rs b/src/test/run-pass-valgrind/unsized-locals/long-live-the-unsized-temporary.rs
new file mode 100644
index 00000000000..e1fda427b4e
--- /dev/null
+++ b/src/test/run-pass-valgrind/unsized-locals/long-live-the-unsized-temporary.rs
@@ -0,0 +1,65 @@
+// Copyright 2018 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(unsized_locals)]
+
+use std::fmt;
+
+fn gen_foo() -> Box<fmt::Display> {
+    Box::new(Box::new("foo"))
+}
+
+fn foo(x: fmt::Display) {
+    assert_eq!(x.to_string(), "foo");
+}
+
+fn foo_indirect(x: fmt::Display) {
+    foo(x);
+}
+
+fn main() {
+    foo(*gen_foo());
+    foo_indirect(*gen_foo());
+
+    {
+        let x: fmt::Display = *gen_foo();
+        foo(x);
+    }
+
+    {
+        let x: fmt::Display = *gen_foo();
+        let y: fmt::Display = *gen_foo();
+        foo(x);
+        foo(y);
+    }
+
+    {
+        let mut cnt: usize = 3;
+        let x = loop {
+            let x: fmt::Display = *gen_foo();
+            if cnt == 0 {
+                break x;
+            } else {
+                cnt -= 1;
+            }
+        };
+        foo(x);
+    }
+
+    {
+        let x: fmt::Display = *gen_foo();
+        let x = if true {
+            x
+        } else {
+            *gen_foo()
+        };
+        foo(x);
+    }
+}