auto merge of #14696 : jakub-/rust/dead-struct-fields, r=alexcrichton

This uncovered some dead code, most notably in middle/liveness.rs, which I think suggests there must be something fishy with that part of the code.

The #[allow(dead_code)] annotations on some of the fields I am not super happy about but as I understand, marker type may disappear at some point.

3 files changed, 5 insertions, 5 deletions

diff --git a/src/libstd/collections/hashmap.rs b/src/libstd/collections/hashmap.rs
index a780b63bfd0..34851265409 100644
--- a/src/libstd/collections/hashmap.rs
+++ b/src/libstd/collections/hashmap.rs
@@ -393,7 +393,7 @@ mod table {
         }
 
         pub fn move_iter(self) -> MoveEntries<K, V> {
-            MoveEntries { table: self, idx: 0, elems_seen: 0 }
+            MoveEntries { table: self, idx: 0 }
         }
     }
 
@@ -428,8 +428,7 @@ mod table {
     /// Iterator over the entries in a table, consuming the table.
     pub struct MoveEntries<K, V> {
         table: RawTable<K, V>,
-        idx: uint,
-        elems_seen: uint,
+        idx: uint
     }
 
     impl<'a, K, V> Iterator<(&'a K, &'a V)> for Entries<'a, K, V> {
diff --git a/src/libstd/rt/backtrace.rs b/src/libstd/rt/backtrace.rs
index 423f372f018..a1372b51d47 100644
--- a/src/libstd/rt/backtrace.rs
+++ b/src/libstd/rt/backtrace.rs
@@ -325,6 +325,7 @@ mod imp {
     #[cfg(target_os = "macos")]
     fn print(w: &mut Writer, idx: int, addr: *libc::c_void) -> IoResult<()> {
         use intrinsics;
+        #[repr(C)]
         struct Dl_info {
             dli_fname: *libc::c_char,
             dli_fbase: *libc::c_void,
diff --git a/src/libstd/task.rs b/src/libstd/task.rs
index 9ee62ee3d81..a4e1ad84252 100644
--- a/src/libstd/task.rs
+++ b/src/libstd/task.rs
@@ -84,7 +84,7 @@ pub struct TaskBuilder {
     /// Options to spawn the new task with
     pub opts: TaskOpts,
     gen_body: Option<proc(v: proc():Send):Send -> proc():Send>,
-    nocopy: Option<marker::NoCopy>,
+    nocopy: marker::NoCopy,
 }
 
 impl TaskBuilder {
@@ -94,7 +94,7 @@ impl TaskBuilder {
         TaskBuilder {
             opts: TaskOpts::new(),
             gen_body: None,
-            nocopy: None,
+            nocopy: marker::NoCopy,
         }
     }