bump gpfsl

opam

@@ -10,5 +10,5 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: [ "sh" "-c" "rm -rf '%{lib}%/coq/user-contrib/lrust'" ]
 depends: [
-  "coq-gpfsl" { (= "dev.2019-01-30.2.6a0acfb2") | (= "dev") }
+  "coq-gpfsl" { (= "dev.2019-01-31.0.5495b101") | (= "dev") }
 ]

theories/lang/lib/arc.v

@@ -4,7 +4,7 @@ From iris.program_logic Require Import weakestpre.
 From iris.proofmode Require Import tactics.
 From iris.bi Require Import fractional.
 From iris.algebra Require Import excl csum frac auth.
-From lrust.lang Require Import lang proofmode notation new_delete.
+From lrust.lang Require Import proofmode notation new_delete.
 Set Default Proof Using "Type".
 
 (* JH: while working on Arc, I think figured that the "weak count