librustc: Ensure that proc upvars have static lifetime.

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());

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, ..

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);
+}
+