Rollup merge of #24268 - pnkfelix:regression-tests, r=alexcrichton

A pair of regression tests for issues that seem to have been fixed since they were originally filed.

src/test/run-pass/issue-21400.rs

@@ -0,0 +1,66 @@
+// Copyright 2015 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.
+
+// Regression test for #21400 which itself was extracted from
+// stackoverflow.com/questions/28031155/is-my-borrow-checker-drunk/28031580
+
+fn main() {
+    let mut t = Test;
+    assert_eq!(t.method1("one"), Ok(1));
+    assert_eq!(t.method2("two"), Ok(2));
+    assert_eq!(t.test(), Ok(2));
+}
+
+struct Test;
+
+impl Test {
+    fn method1(&mut self, _arg: &str) -> Result<usize, &str> {
+        Ok(1)
+    }
+
+    fn method2(self: &mut Test, _arg: &str) -> Result<usize, &str> {
+        Ok(2)
+    }
+
+    fn test(self: &mut Test) -> Result<usize, &str> {
+        let s = format!("abcde");
+        // (Originally, this invocation of method2 was saying that `s`
+        // does not live long enough.)
+        let data = match self.method2(&*s) {
+            Ok(r) => r,
+            Err(e) => return Err(e)
+        };
+        Ok(data)
+    }
+}
+
+// Below is a closer match for the original test that was failing to compile
+
+pub struct GitConnect;
+
+impl GitConnect {
+    fn command(self: &mut GitConnect, _s: &str) -> Result<Vec<Vec<u8>>, &str> {
+        unimplemented!()
+    }
+
+    pub fn git_upload_pack(self: &mut GitConnect) -> Result<String, &str> {
+        let c = format!("git-upload-pack");
+
+        let mut out = String::new();
+        let data = try!(self.command(&c));
+
+        for line in data.iter() {
+            out.push_str(&format!("{:?}", line));
+        }
+
+        Ok(out)
+    }
+}
+

src/test/run-pass/issue-21486.rs

@@ -0,0 +1,86 @@
+// Copyright 2015 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.
+
+// Issue #21486: Make sure that all structures are dropped, even when
+// created via FRU and control-flow breaks in the middle of
+// construction.
+
+
+use std::sync::atomic::{Ordering, AtomicUsize, ATOMIC_USIZE_INIT};
+
+#[derive(Debug)]
+struct Noisy(u8);
+impl Drop for Noisy {
+    fn drop(&mut self) {
+        // println!("splat #{}", self.0);
+        event(self.0);
+    }
+}
+
+#[allow(dead_code)]
+#[derive(Debug)]
+struct Foo { n0: Noisy, n1: Noisy }
+impl Foo {
+    fn vals(&self) -> (u8, u8) { (self.n0.0, self.n1.0) }
+}
+
+fn leak_1_ret() -> Foo {
+    let _old_foo = Foo { n0: Noisy(1), n1: Noisy(2) };
+    Foo { n0: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
+          .._old_foo
+    };
+}
+
+fn leak_2_ret() -> Foo {
+    let _old_foo = Foo { n0: Noisy(1), n1: Noisy(2) };
+    Foo { n1: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
+          .._old_foo
+    };
+}
+
+// In this case, the control flow break happens *before* we construct
+// `Foo(Noisy(1),Noisy(2))`, so there should be no record of it in the
+// event log.
+fn leak_3_ret() -> Foo {
+    let _old_foo = || Foo { n0: Noisy(1), n1: Noisy(2) };
+    Foo { n1: { return Foo { n0: Noisy(3), n1: Noisy(4) } },
+          .._old_foo()
+    };
+}
+
+pub fn main() {
+    reset_log();
+    assert_eq!(leak_1_ret().vals(), (3,4));
+    assert_eq!(0x01_02_03_04, event_log());
+
+    reset_log();
+    assert_eq!(leak_2_ret().vals(), (3,4));
+    assert_eq!(0x01_02_03_04, event_log());
+
+    reset_log();
+    assert_eq!(leak_3_ret().vals(), (3,4));
+    assert_eq!(0x03_04, event_log());
+}
+
+static LOG: AtomicUsize = ATOMIC_USIZE_INIT;
+
+fn reset_log() {
+    LOG.store(0, Ordering::SeqCst);
+}
+
+fn event_log() -> usize {
+    LOG.load(Ordering::SeqCst)
+}
+
+fn event(tag: u8) {
+    let old_log = LOG.load(Ordering::SeqCst);
+    let new_log = (old_log << 8) + tag as usize;
+    LOG.store(new_log, Ordering::SeqCst);
+}