Auto merge of #44878 - Nashenas88:master, r=nikomatsakis

Store a new Region value every time we create a new region variable

Paired with @spastorino to walk through this and implement #44870.

src/librustc/dep_graph/graph.rs

@@ -406,7 +406,7 @@ impl DepGraph {
         for (current_dep_node_index, edges) in current_dep_graph.edges.iter_enumerated() {
             let start = edge_list_data.len() as u32;
             // This should really just be a memcpy :/
-            edge_list_data.extend(edges.iter().map(|i| SerializedDepNodeIndex(i.index)));
+            edge_list_data.extend(edges.iter().map(|i| SerializedDepNodeIndex::new(i.index())));
             let end = edge_list_data.len() as u32;
 
             debug_assert_eq!(current_dep_node_index.index(), edge_list_indices.len());

src/librustc/dep_graph/serialized.rs

@@ -14,23 +14,7 @@ use dep_graph::DepNode;
 use ich::Fingerprint;
 use rustc_data_structures::indexed_vec::{IndexVec, Idx};
 
-/// The index of a DepNode in the SerializedDepGraph::nodes array.
-#[derive(Copy, Clone, Hash, Eq, PartialEq, Ord, PartialOrd, Debug,
-         RustcEncodable, RustcDecodable)]
-pub struct SerializedDepNodeIndex(pub u32);
-
-impl Idx for SerializedDepNodeIndex {
-    #[inline]
-    fn new(idx: usize) -> Self {
-        assert!(idx <= ::std::u32::MAX as usize);
-        SerializedDepNodeIndex(idx as u32)
-    }
-
-    #[inline]
-    fn index(self) -> usize {
-        self.0 as usize
-    }
-}
+newtype_index!(SerializedDepNodeIndex);
 
 /// Data for use when recompiling the **current crate**.
 #[derive(Debug, RustcEncodable, RustcDecodable)]

src/librustc/lib.rs

@@ -43,6 +43,7 @@
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(conservative_impl_trait)]
+#![feature(const_fn)]
 #![feature(core_intrinsics)]
 #![feature(i128_type)]
 #![cfg_attr(windows, feature(libc))]
@@ -71,7 +72,7 @@ extern crate graphviz;
 extern crate libc;
 extern crate owning_ref;
 extern crate rustc_back;
-extern crate rustc_data_structures;
+#[macro_use] extern crate rustc_data_structures;
 extern crate serialize;
 extern crate rustc_const_math;
 extern crate rustc_errors as errors;

src/librustc/mir/mod.rs

@@ -43,30 +43,6 @@ pub mod visit;
 pub mod transform;
 pub mod traversal;
 
-macro_rules! newtype_index {
-    ($name:ident, $debug_name:expr) => (
-        #[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord,
-         RustcEncodable, RustcDecodable)]
-        pub struct $name(u32);
-
-        impl Idx for $name {
-            fn new(value: usize) -> Self {
-                assert!(value < (u32::MAX) as usize);
-                $name(value as u32)
-            }
-            fn index(self) -> usize {
-                self.0 as usize
-            }
-        }
-
-        impl Debug for $name {
-            fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
-                write!(fmt, "{}{}", $debug_name, self.0)
-            }
-        }
-    )
-}
-
 /// Types for locals
 type LocalDecls<'tcx> = IndexVec<Local, LocalDecl<'tcx>>;