From 199e60aa220da58f3ce10fe0cc30ce715da3f0c9 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 16 Jun 2015 13:04:01 -0700
Subject: [PATCH] Remove unused type InteriorSafety.

---
 src/librustc/middle/mem_categorization.rs     | 21 ++++---------------
 src/librustc/middle/ty.rs                     |  4 ----
 .../borrowck/gather_loans/mod.rs              | 20 ++++--------------
 3 files changed, 8 insertions(+), 37 deletions(-)

diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index 6d8e412c8a5..9d0a1821deb 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -65,7 +65,6 @@ pub use self::InteriorKind::*;
 pub use self::FieldName::*;
 pub use self::ElementKind::*;
 pub use self::MutabilityCategory::*;
-pub use self::InteriorSafety::*;
 pub use self::AliasableReason::*;
 pub use self::Note::*;
 pub use self::deref_kind::*;
@@ -1385,12 +1384,6 @@ impl<'t,'tcx,TYPER:Typer<'tcx>> MemCategorizationContext<'t,TYPER> {
     }
 }
 
-#[derive(Copy, Clone, Debug)]
-pub enum InteriorSafety {
-    InteriorUnsafe,
-    InteriorSafe
-}
-
 #[derive(Clone, Debug)]
 pub enum Aliasability {
     FreelyAliasable(AliasableReason),
@@ -1404,8 +1397,8 @@ pub enum AliasableReason {
     AliasableClosure(ast::NodeId), // Aliasable due to capture Fn closure env
     AliasableOther,
     UnaliasableImmutable, // Created as needed upon seeing ImmutableUnique
-    AliasableStatic(InteriorSafety),
-    AliasableStaticMut(InteriorSafety),
+    AliasableStatic,
+    AliasableStaticMut,
 }
 
 impl<'tcx> cmt_<'tcx> {
@@ -1469,16 +1462,10 @@ impl<'tcx> cmt_<'tcx> {
             }
 
             cat_static_item(..) => {
-                let int_safe = if ty::type_interior_is_unsafe(ctxt, self.ty) {
-                    InteriorUnsafe
-                } else {
-                    InteriorSafe
-                };
-
                 if self.mutbl.is_mutable() {
-                    FreelyAliasable(AliasableStaticMut(int_safe))
+                    FreelyAliasable(AliasableStaticMut)
                 } else {
-                    FreelyAliasable(AliasableStatic(int_safe))
+                    FreelyAliasable(AliasableStatic)
                 }
             }
 
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index c24f1d3e7be..e71babf142a 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -3733,10 +3733,6 @@ impl fmt::Debug for TypeContents {
     }
 }
 
-pub fn type_interior_is_unsafe<'tcx>(cx: &ctxt<'tcx>, ty: Ty<'tcx>) -> bool {
-    type_contents(cx, ty).interior_unsafe()
-}
-
 pub fn type_contents<'tcx>(cx: &ctxt<'tcx>, ty: Ty<'tcx>) -> TypeContents {
     return memoized(&cx.tc_cache, ty, |ty| {
         tc_ty(cx, ty, &mut FnvHashMap())
diff --git a/src/librustc_borrowck/borrowck/gather_loans/mod.rs b/src/librustc_borrowck/borrowck/gather_loans/mod.rs
index 733d486d2d2..012e01507de 100644
--- a/src/librustc_borrowck/borrowck/gather_loans/mod.rs
+++ b/src/librustc_borrowck/borrowck/gather_loans/mod.rs
@@ -191,23 +191,11 @@ fn check_aliasability<'a, 'tcx>(bccx: &BorrowckCtxt<'a, 'tcx>,
             /* Uniquely accessible path -- OK for `&` and `&mut` */
             Ok(())
         }
-        (mc::Aliasability::FreelyAliasable(mc::AliasableStatic(safety)), ty::ImmBorrow) => {
-            // Borrow of an immutable static item:
-            match safety {
-                mc::InteriorUnsafe => {
-                    // If the static item contains an Unsafe<T>, it has interior
-                    // mutability.  In such cases, another phase of the compiler
-                    // will ensure that the type is `Sync` and then trans will
-                    // not put it in rodata, so this is ok to allow.
-                    Ok(())
-                }
-                mc::InteriorSafe => {
-                    // Immutable static can be borrowed, no problem.
-                    Ok(())
-                }
-            }
+        (mc::Aliasability::FreelyAliasable(mc::AliasableStatic), ty::ImmBorrow) => {
+            // Borrow of an immutable static item.
+            Ok(())
         }
-        (mc::Aliasability::FreelyAliasable(mc::AliasableStaticMut(..)), _) => {
+        (mc::Aliasability::FreelyAliasable(mc::AliasableStaticMut), _) => {
             // Even touching a static mut is considered unsafe. We assume the
             // user knows what they're doing in these cases.
             Ok(())