Bump Iris.

opam

@@ -11,5 +11,5 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: [ "sh" "-c" "rm -rf '%{lib}%/coq/user-contrib/lrust'" ]
 depends: [
-  "coq-iris" { (= "dev.2019-06-10.2.47f304f6") | (= "dev") }
+  "coq-iris" { (= "dev.2019-06-12.4.ae1dd418") | (= "dev") }
 ]

theories/lang/adequacy.v

@@ -27,7 +27,7 @@ Proof.
   iMod (own_alloc (● (∅ : heap_freeableUR))) as (fγ) "Hfγ";
     first by apply auth_auth_valid.
   set (Hheap := HeapG _ _ _ vγ fγ).
-  iModIntro. iExists (λ σ _, heap_ctx σ). iSplitL.
+  iModIntro. iExists (λ σ _, heap_ctx σ), (λ _, True%I). iSplitL.
   { iExists ∅. by iFrame. }
   by iApply (Hwp (LRustG _ _ Hheap)).
 Qed.