Bumped dune version to 2.7, induced cleaning of Makefile

Makefile

@@ -16,9 +16,8 @@ uninstall:
 
 .PHONY: bench
 bench:
-	@ dune build bench/bench.exe
-	@ dune build @bench-generic-sexp --force 2>&1 | dune exec bench/conversions.exe -- generic
-	@ dune build @bench-buffer-sexp --force 2>&1 | dune exec bench/conversions.exe -- buffer
+	@dune build --display=quiet @bench-generic-sexp --force
+	@dune build --display=quiet @bench-buffer-sexp --force
 
 .PHONY: bench-local
 bench-local:

bench/dune

@@ -5,25 +5,27 @@
  (flags (-safe-string))
  (libraries yojson core_bench core core_unix.command_unix core_bench.internals sexplib))
 
-(alias
-  (name bench-generic)
+(rule
+  (alias bench-generic)
   (deps bench.json)
   (action (run ./bench.exe generic)))
 
-(alias
-  (name bench-generic-sexp)
+(rule
+  (alias bench-generic-sexp)
   (deps bench.json)
-  (action (run ./bench.exe generic -sexp)))
+  (action (pipe-stdout (run ./bench.exe generic -sexp)
+                       (run ./conversions.exe -- generic))))
 
-(alias
-  (name bench-buffer)
+(rule
+  (alias bench-buffer)
   (deps bench.json)
   (action (run ./bench.exe buffer)))
 
-(alias
-  (name bench-buffer-sexp)
+(rule
+  (alias bench-buffer-sexp)
   (deps bench.json)
-  (action (run ./bench.exe buffer -sexp)))
+  (action (pipe-stdout (run ./bench.exe buffer -sexp)
+                       (run ./conversions.exe -- buffer))))
 
 (alias
   (name bench)

dune-project

@@ -1,2 +1,2 @@
-(lang dune 1.0)
+(lang dune 2.7)
 (name yojson)

test/compliance/dune

@@ -6,8 +6,8 @@
   )
 )
 
-(alias
-  (name compliance-tests)
+(rule
+  (alias compliance-tests)
   (deps
     (:test test.exe)
     (glob_files test_cases/*)

test/pretty/dune

@@ -15,8 +15,8 @@
       atd.output.json
       (run ./atd.exe))))
 
-(alias
- (name runtest)
+(rule
+ (alias runtest)
  (action
   (progn
    (diff test.expected.json test.output.json)