librustc: Ensure that proc upvars have static lifetime.

Since procs do not have lifetime bounds, we must do this to maintain
safety.

This can break code that incorrectly captured references in procedure
types. Change such code to not do this, perhaps with a trait object
instead.

A better solution would be to add higher-rank lifetime support to procs.
However, this would be a lot of work for a feature we want to remove in
favor of unboxed closures. The corresponding "real fix" is #15067.

Closes #14036.

[breaking-change]

3 files changed, 38 insertions, 2 deletions

diff --git a/src/libnative/io/process.rs b/src/libnative/io/process.rs
index c421dada205..59a075f22b2 100644
--- a/src/libnative/io/process.rs
+++ b/src/libnative/io/process.rs
@@ -533,6 +533,10 @@ fn spawn_process_os(cfg: ProcessConfig,
 
     let dirp = cfg.cwd.map(|c| c.with_ref(|p| p)).unwrap_or(ptr::null());
 
+    let cfg = unsafe {
+        mem::transmute::<ProcessConfig,ProcessConfig<'static>>(cfg)
+    };
+
     with_envp(cfg.env, proc(envp) {
         with_argv(cfg.program, cfg.args, proc(argv) unsafe {
             let (mut input, mut output) = try!(pipe());
diff --git a/src/librustc/middle/kind.rs b/src/librustc/middle/kind.rs
index 970ae36238b..34754f045ff 100644
--- a/src/librustc/middle/kind.rs
+++ b/src/librustc/middle/kind.rs
@@ -198,8 +198,14 @@ fn with_appropriate_checker(cx: &Context,
     let fty = ty::node_id_to_type(cx.tcx, id);
     match ty::get(fty).sty {
         ty::ty_closure(box ty::ClosureTy {
-            store: ty::UniqTraitStore, bounds, ..
-        }) => b(|cx, fv| check_for_uniq(cx, fv, bounds)),
+            store: ty::UniqTraitStore,
+            bounds: mut bounds, ..
+        }) => {
+            // Procs can't close over non-static references!
+            bounds.add(ty::BoundStatic);
+
+            b(|cx, fv| check_for_uniq(cx, fv, bounds))
+        }
 
         ty::ty_closure(box ty::ClosureTy {
             store: ty::RegionTraitStore(region, _), bounds, ..
diff --git a/src/test/compile-fail/proc-static-bound.rs b/src/test/compile-fail/proc-static-bound.rs
new file mode 100644
index 00000000000..f11ddc0151f
--- /dev/null
+++ b/src/test/compile-fail/proc-static-bound.rs
@@ -0,0 +1,26 @@
+// Copyright 2014 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.
+
+fn main() {
+    let mut x = Some(1);
+    let mut p: proc(&mut Option<int>) = proc(_) {};
+    match x {
+        Some(ref y) => {
+            p = proc(z: &mut Option<int>) {
+                *z = None;
+                let _ = y;
+                //~^ ERROR cannot capture variable of type `&int`, which does not fulfill `'static`
+            };
+        }
+        None => {}
+    }
+    p(&mut x);
+}
+