Restore comments

theories/concurrent_stacks/concurrent_stack1.v

@@ -4,6 +4,8 @@ From iris.heap_lang Require Import notation proofmode.
 From iris_examples.concurrent_stacks Require Import specs.
 Set Default Proof Using "Type".
 
+(** Stack 1: No helping, bag spec. *)
+
 Definition new_stack : val := λ: "_", ref NONEV.
 Definition push : val :=
   rec: "push" "s" "v" :=

theories/concurrent_stacks/concurrent_stack2.v

@@ -5,6 +5,8 @@ From iris.program_logic Require Export weakestpre.
 From iris_examples.concurrent_stacks Require Import specs.
 Set Default Proof Using "Type".
 
+(** Stack 2: Helping, bag spec. *)
+
 Definition mk_offer : val :=
   λ: "v", ("v", ref #0).
 Definition revoke_offer : val :=

theories/concurrent_stacks/concurrent_stack3.v

@@ -3,6 +3,8 @@ From iris.heap_lang Require Export lang proofmode notation.
 From iris_examples.concurrent_stacks Require Import specs.
 Set Default Proof Using "Type".
 
+(** Stack 3: No helping, CAP spec. *)
+
 Definition mk_stack : val := λ: "_", ref NONEV.
 Definition push : val :=
   rec: "push" "s" "v" :=

theories/concurrent_stacks/concurrent_stack4.v

@@ -3,6 +3,8 @@ From iris.heap_lang Require Export lang proofmode notation.
 From iris.algebra Require Import excl.
 From iris_examples.concurrent_stacks Require Import specs.
 
+(** Stack 4: Helping, CAP spec. *)
+
 Definition mk_offer : val :=
   λ: "v", ("v", ref #0).
 Definition revoke_offer : val :=