Unique pointers containing pinned kinds become pinned

Issue #409

Author: brson

src/comp/middle/ty.rs

@@ -1021,11 +1021,18 @@ fn type_kind(cx: ctxt, ty: t) -> ast::kind {
       }
       // Pointers and unique boxes / vecs raise pinned to shared,
       // otherwise pass through their pointee kind.
-      ty_ptr(tm) | ty_vec(tm) | ty_uniq(tm) {
+      ty_ptr(tm) | ty_vec(tm) {
         let k = type_kind(cx, tm.ty);
         if k == ast::kind_pinned { k = ast::kind_shared; }
         result = kind::lower_kind(result, k);
       }
+      // Unique boxes pass through their pointee kind. FIXME: Shouldn't
+      // pointers and vecs do this too to avoid copying vectors of pinned
+      // things?
+      ty_uniq(tm) {
+        let k = type_kind(cx, tm.ty);
+        result = kind::lower_kind(result, k);
+      }
       // Records lower to the lowest of their members.
       ty_rec(flds) {
         for f: field in flds {

src/test/compile-fail/unique-pinned-nocopy.rs

@@ -0,0 +1,10 @@
+// error-pattern: mismatched kind
+
+resource r(b: bool) {
+}
+
+fn main() {
+    let i = ~r(true);
+    let j;
+    j = i;
+}

src/test/run-pass/generic-exterior-unique.rs

@@ -1,8 +1,6 @@
-
-
 type recbox<T> = {x: ~T};
 
-fn reclift<T>(t: T) -> recbox<T> { ret {x: ~t}; }
+fn reclift<@T>(t: T) -> recbox<T> { ret {x: ~t}; }
 
 fn main() {
     let foo: int = 17;

src/test/run-pass/unique-swap2.rs

@@ -1,3 +1,9 @@
+// xfail-test
+
+// This no longer works because ~r() is lowered to a pinned type
+// (which can't be swapped). Should probably be a compile-fail
+// test.
+
 resource r(i: @mutable int) {
     *i += 1;
 }