diff --git a/src/Driver.ml b/src/Driver.ml
index ebd5e5bf6..01ebf0838 100644
--- a/src/Driver.ml
+++ b/src/Driver.ml
@@ -108,7 +108,7 @@ class options args =
       | Some name -> name
     method get_help = !help
     method get_include_paths = !paths
-    method basename = Filename.chop_suffix (Filename.basename self#get_infile) ".expr"
+    method basename = Filename.chop_suffix (Filename.basename self#get_infile) ".lama"
     method topname =
       match !mode with
       | `Compile -> "init" ^ self#basename
diff --git a/src/stdpath.ml b/src/stdpath.ml
index 3fb2a1d08..e94b5487d 100644
--- a/src/stdpath.ml
+++ b/src/stdpath.ml
@@ -1 +1 @@
-let path = "/home/db/.opam/4.13.1+flambda/share/Lama"
+let path = "/home/db/.opam/4.14.0+flambda/share/Lama"
diff --git a/src/version.ml b/src/version.ml
index 933e835ab..64f21e11e 100644
--- a/src/version.ml
+++ b/src/version.ml
@@ -1 +1 @@
-let version = "Version 1.10, 33b082f21, Thu Apr 14 17:40:35 2022 +0300"
+let version = "Version 1.10, e5c5f914b, Thu Apr 14 17:41:56 2022 +0300"
diff --git a/stdlib/Matcher.lama b/stdlib/Matcher.lama
index 4dee30118..ee0eee366 100644
--- a/stdlib/Matcher.lama
+++ b/stdlib/Matcher.lama
@@ -46,6 +46,14 @@ fun createMatcher (buf, pos, line, col) {
   }
 
   fun matchString (s) {
+
+
+    fun min (x, y) {
+      if x < y then x else y fi
+    }
+    
+    -- printf ("Matching string %s against %s...\n", s, substring (buf, pos, min (10, buf.length - pos)));
+
     if s.length > rest ()
     then Fail (sprintf ("""%s"" expected", s), line, col)
     elif matchSubString (buf, s, pos) then Succ (s, shift (s.length)) 
@@ -55,7 +63,13 @@ fun createMatcher (buf, pos, line, col) {
 
   fun matchRegexp (r) {
     var n;
+
+    fun min (x, y) {
+      if x < y then x else y fi
+    }
     
+    -- printf ("Matching regexp %s against %s...\n", r.string, substring (buf, pos, min (10, buf.length - pos)));
+
     if (n := regexpMatch (r[0], buf, pos)) >= 0
     then Succ (substring (buf, pos, n), shift (n))
     else Fail (sprintf ("%s expected", r[1]), line, col)
diff --git a/stdlib/Ostap.lama b/stdlib/Ostap.lama
index 9fd73ff16..99efddb04 100644
--- a/stdlib/Ostap.lama
+++ b/stdlib/Ostap.lama
@@ -44,6 +44,7 @@ public fun memo (f) {
       if log then printf ("Applying memoized parser to %s\n", s.string) fi;
       case findMap (deref (t), s) of
         None  ->
+          if log then printf ("New stream item\n") fi;
           t ::= addMap (deref (t), s, [addSet (emptySet (compare), k), emptySet (fun (r1, r2) {
                                                                                    case [r1, r2] of
                                                                                      [Fail (_, _, _), Fail (_, _, _)] -> 0
@@ -51,7 +52,7 @@ public fun memo (f) {
                                                                                    esac
                                                                                  })]);
           f (fun (r) {
-               r := lookupMemo (restab, r);
+               --r := lookupMemo (restab, r);
                if log then printf ("Running continuation with result %s\n", r.string) fi;
                case findMap (deref (t), s) of
                  Some ([ks, rs]) ->                   
@@ -74,6 +75,7 @@ public fun memo (f) {
 }
 
 public fun token (x) {
+  -- printf ("token: %s\n", x.string);
   case x of
     #str -> memo $ fun (k) {fun (s) {k $ matchString (s, x)}}
   | _    -> memo $ fun (k) {fun (s) {k $ matchRegexp (s, x)}}