rollup merge of #23948: nikomatsakis/feature-gate-rust-abi

Like it says.

r? @alexcrichton

1 files changed, 9 insertions, 3 deletions

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 113827a3b40..4c01cecc67c 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -25,7 +25,7 @@
 use self::Status::*;
 use self::AttributeType::*;
 
-use abi::RustIntrinsic;
+use abi::Abi;
 use ast::NodeId;
 use ast;
 use attr;
@@ -517,7 +517,7 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
                                        across platforms, it is recommended to \
                                        use `#[link(name = \"foo\")]` instead")
                 }
-                if foreign_module.abi == RustIntrinsic {
+                if foreign_module.abi == Abi::RustIntrinsic {
                     self.gate_feature("intrinsics",
                                       i.span,
                                       "intrinsics are subject to change")
@@ -633,11 +633,17 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
                 span: Span,
                 _node_id: NodeId) {
         match fn_kind {
-            visit::FkItemFn(_, _, _, abi) if abi == RustIntrinsic => {
+            visit::FkItemFn(_, _, _, abi) if abi == Abi::RustIntrinsic => {
                 self.gate_feature("intrinsics",
                                   span,
                                   "intrinsics are subject to change")
             }
+            visit::FkItemFn(_, _, _, abi) |
+            visit::FkMethod(_, &ast::MethodSig { abi, .. }) if abi == Abi::RustCall => {
+                self.gate_feature("unboxed_closures",
+                                  span,
+                                  "rust-call ABI is subject to change")
+            }
             _ => {}
         }
         visit::walk_fn(self, fn_kind, fn_decl, block, span);