Bump std++.

opam

@@ -9,5 +9,5 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: [ "sh" "-c" "rm -rf '%{lib}%/coq/user-contrib/actris" ]
 depends: [
-  "coq-iris-heap-lang" { (= "dev.2021-01-26.0.a26cf167") | (= "dev") }
+  "coq-iris-heap-lang" { (= "dev.2021-03-12.0.5011fae3") | (= "dev") }
 ]

theories/examples/map_reduce.v

@@ -265,7 +265,7 @@ Section mapper.
       wp_smart_apply ("IH" with "[ ] [//] [//] Hl Hcsort Hcred HImiy"); first done.
       iIntros (zs'); iDestruct 1 as (Hzs) "HIC"; simplify_eq/=.
       iApply ("HΦ" $! (zs' ++ red i ys)). iSplit; last by rewrite -assoc_L.
-      iPureIntro. rewrite (gmultiset_disj_union_difference {[ i,ys ]} Y)
+      iPureIntro. rewrite (gmultiset_disj_union_difference {[ (i,ys) ]} Y)
         -?gmultiset_elem_of_singleton_subseteq //.
       rewrite (comm_L disj_union) gmultiset_elements_disj_union.
       rewrite gmultiset_elements_singleton assoc_L Hzs !bind_app /=.