rustc: Remove special treatment for Freeze and NoFreeze

Fixes #12577

Author: flaper87

src/librustc/metadata/tydecode.rs

@@ -590,9 +590,6 @@ fn parse_bounds(st: &mut PState, conv: conv_did) -> ty::ParamBounds {
             'S' => {
                 param_bounds.builtin_bounds.add(ty::BoundSend);
             }
-            'K' => {
-                param_bounds.builtin_bounds.add(ty::BoundFreeze);
-            }
             'O' => {
                 param_bounds.builtin_bounds.add(ty::BoundStatic);
             }

src/librustc/metadata/tyencode.rs

@@ -405,7 +405,6 @@ fn enc_bounds(w: &mut MemWriter, cx: &ctxt, bs: &ty::ParamBounds) {
     for bound in bs.builtin_bounds.iter() {
         match bound {
             ty::BoundSend => mywrite!(w, "S"),
-            ty::BoundFreeze => mywrite!(w, "K"),
             ty::BoundStatic => mywrite!(w, "O"),
             ty::BoundSized => mywrite!(w, "Z"),
             ty::BoundPod => mywrite!(w, "P"),

src/librustc/middle/lang_items.rs

@@ -13,7 +13,7 @@
 // Language items are items that represent concepts intrinsic to the language
 // itself. Examples are:
 //
-// * Traits that specify "kinds"; e.g. "Freeze", "Send".
+// * Traits that specify "kinds"; e.g. "Share", "Send".
 //
 // * Traits that represent operators; e.g. "Add", "Sub", "Index".
 //
@@ -82,9 +82,7 @@ impl LanguageItems {
     }
 
     pub fn to_builtin_kind(&self, id: ast::DefId) -> Option<ty::BuiltinBound> {
-        if Some(id) == self.freeze_trait() {
-            Some(ty::BoundFreeze)
-        } else if Some(id) == self.send_trait() {
+        if Some(id) == self.send_trait() {
             Some(ty::BoundSend)
         } else if Some(id) == self.sized_trait() {
             Some(ty::BoundSized)
@@ -210,7 +208,6 @@ pub fn collect_language_items(krate: &ast::Crate,
 
 lets_do_this! {
 //  Variant name,                    Name,                      Method name;
-    FreezeTraitLangItem,             "freeze",                  freeze_trait;
     SendTraitLangItem,               "send",                    send_trait;
     SizedTraitLangItem,              "sized",                   sized_trait;
     PodTraitLangItem,                "pod",                     pod_trait;
@@ -275,7 +272,6 @@ lets_do_this! {
     ContravariantLifetimeItem,       "contravariant_lifetime",  contravariant_lifetime;
     InvariantLifetimeItem,           "invariant_lifetime",      invariant_lifetime;
 
-    NoFreezeItem,                    "no_freeze_bound",         no_freeze_bound;
     NoSendItem,                      "no_send_bound",           no_send_bound;
     NoPodItem,                       "no_pod_bound",            no_pod_bound;
     NoShareItem,                     "no_share_bound",          no_share_bound;

src/librustc/middle/ty.rs

@@ -838,7 +838,6 @@ pub type BuiltinBounds = EnumSet<BuiltinBound>;
 pub enum BuiltinBound {
     BoundStatic,
     BoundSend,
-    BoundFreeze,
     BoundSized,
     BoundPod,
     BoundShare,
@@ -852,7 +851,6 @@ pub fn AllBuiltinBounds() -> BuiltinBounds {
     let mut set = EnumSet::empty();
     set.add(BoundStatic);
     set.add(BoundSend);
-    set.add(BoundFreeze);
     set.add(BoundSized);
     set.add(BoundShare);
     set
@@ -1902,9 +1900,6 @@ def_type_content_sets!(
         //       that it neither reaches nor owns a managed pointer.
         Nonsendable                         = 0b0000_0111__0000_0100__0000,
 
-        // Things that prevent values from being considered freezable
-        Nonfreezable                        = 0b0000_1000__0000_0000__0000,
-
         // Things that prevent values from being considered 'static
         Nonstatic                           = 0b0000_0010__0000_0000__0000,
 
@@ -1939,7 +1934,6 @@ impl TypeContents {
     pub fn meets_bound(&self, cx: &ctxt, bb: BuiltinBound) -> bool {
         match bb {
             BoundStatic => self.is_static(cx),
-            BoundFreeze => self.is_freezable(cx),
             BoundSend => self.is_sendable(cx),
             BoundSized => self.is_sized(cx),
             BoundPod => self.is_pod(cx),
@@ -1975,10 +1969,6 @@ impl TypeContents {
         self.intersects(TC::OwnsOwned)
     }
 
-    pub fn is_freezable(&self, _: &ctxt) -> bool {
-        !self.intersects(TC::Nonfreezable)
-    }
-
     pub fn is_sized(&self, _: &ctxt) -> bool {
         !self.intersects(TC::Nonsized)
     }
@@ -2083,10 +2073,6 @@ pub fn type_is_sendable(cx: &ctxt, t: ty::t) -> bool {
     type_contents(cx, t).is_sendable(cx)
 }
 
-pub fn type_is_freezable(cx: &ctxt, t: ty::t) -> bool {
-    type_contents(cx, t).is_freezable(cx)
-}
-
 pub fn type_interior_is_unsafe(cx: &ctxt, t: ty::t) -> bool {
     type_contents(cx, t).interior_unsafe()
 }
@@ -2149,7 +2135,7 @@ pub fn type_contents(cx: &ctxt, ty: t) -> TypeContents {
         cache.insert(ty_id, TC::None);
 
         let result = match get(ty).sty {
-            // Scalar and unique types are sendable, freezable, and durable
+            // Scalar and unique types are sendable, and durable
             ty_nil | ty_bot | ty_bool | ty_int(_) | ty_uint(_) | ty_float(_) |
             ty_bare_fn(_) | ty::ty_char => {
                 TC::None
@@ -2287,9 +2273,7 @@ pub fn type_contents(cx: &ctxt, ty: t) -> TypeContents {
                         did: ast::DefId,
                         tc: TypeContents)
                         -> TypeContents {
-        if Some(did) == cx.lang_items.no_freeze_bound() {
-            tc | TC::ReachesMutable
-        } else if Some(did) == cx.lang_items.no_send_bound() {
+        if Some(did) == cx.lang_items.no_send_bound() {
             tc | TC::ReachesNonsendAnnot
         } else if Some(did) == cx.lang_items.managed_bound() {
             tc | TC::Managed
@@ -2374,7 +2358,6 @@ pub fn type_contents(cx: &ctxt, ty: t) -> TypeContents {
             tc = tc - match bound {
                 BoundStatic => TC::Nonstatic,
                 BoundSend => TC::Nonsendable,
-                BoundFreeze => TC::Nonfreezable,
                 BoundSized => TC::Nonsized,
                 BoundPod => TC::Nonpod,
                 BoundShare => TC::Nonsharable,

src/librustc/util/ppaux.rs

@@ -666,7 +666,6 @@ impl Repr for ty::ParamBounds {
             res.push(match b {
                 ty::BoundStatic => ~"'static",
                 ty::BoundSend => ~"Send",
-                ty::BoundFreeze => ~"Freeze",
                 ty::BoundSized => ~"Sized",
                 ty::BoundPod => ~"Pod",
                 ty::BoundShare => ~"Share",
@@ -954,7 +953,6 @@ impl UserString for ty::BuiltinBound {
         match *self {
             ty::BoundStatic => ~"'static",
             ty::BoundSend => ~"Send",
-            ty::BoundFreeze => ~"Freeze",
             ty::BoundSized => ~"Sized",
             ty::BoundPod => ~"Pod",
             ty::BoundShare => ~"Share",