Test cases for #985

Other restrictions on pinned kinds happened to fix this

Closes #985

Author: brson

src/test/compile-fail/implicit-copy-1.rs

@@ -0,0 +1,21 @@
+// error-pattern: cannot copy pinned type r
+
+resource r(i: @mutable int) {
+    *i = *i + 1;
+}
+
+fn movearg(i: r) {
+    // Implicit copy to mutate reference i
+    let j <- i;
+}
+
+fn main() {
+    let i = @mutable 0;
+    {
+        let j <- r(i);
+        movearg(j);
+    }
+    log_err *i;
+    // nooooooo. destructor ran twice
+    assert *i == 2;
+}

src/test/compile-fail/implicit-copy-2.rs

@@ -0,0 +1,21 @@
+// error-pattern: cannot copy pinned type 'a
+
+resource r(i: @mutable int) {
+    *i = *i + 1;
+}
+
+fn movearg<T>(i: T) {
+    // Implicit copy to mutate reference i
+    let j <- i;
+}
+
+fn main() {
+    let i = @mutable 0;
+    {
+        let j <- r(i);
+        movearg(j);
+    }
+    log_err *i;
+    // nooooooo. destructor ran twice
+    assert *i == 2;
+}