diff --git a/scm-perf/poulpe-scheduler-bin/auto-cases b/scm-perf/poulpe-scheduler-bin/auto-cases
index fca46a017b3d8b3b5cb7e695aa1b46dcd1112b5f_c2NtLXBlcmYvcG91bHBlLXNjaGVkdWxlci1iaW4vYXV0by1jYXNlcw==..f0c52b76f3f3db7c6f9b5f1bff9cb52c47cc2486_c2NtLXBlcmYvcG91bHBlLXNjaGVkdWxlci1iaW4vYXV0by1jYXNlcw== 100755
--- a/scm-perf/poulpe-scheduler-bin/auto-cases
+++ b/scm-perf/poulpe-scheduler-bin/auto-cases
@@ -15,6 +15,11 @@
     "3.7": 'tagged("5.2")::',
 }
 
+FLAVOR_COMPATIBILITY = {
+    "rust": '(9183b7dcfa8d::)'
+}
+
+
 class Case:
 
     def __init__(
@@ -41,5 +46,5 @@
 def mercurial_repository_path(base_dir):
     return base_dir / "repos" / "mercurial"
 
-def list_mercurial_variants(base_dir):
+def list_mercurial_variants(base_dir, changeset):
     """return a list of possible mercurial variants"""
@@ -45,5 +50,12 @@
     """return a list of possible mercurial variants"""
-    return ["default", "pure"] # lets keep it simple for now
+    variants = ["default", "pure"] # lets keep it simple for now
+    for k, v in FLAVOR_COMPATIBILITY.items():
+        revs = list_mercurial_hashes(base_dir, v)
+        if changeset in revs:
+            variants.append(k)
+    return variants
+
+
 
 def list_mercurial_hashes(base_dir, interval="all()"):
     """return a list of possible mercurial hashes"""
@@ -115,9 +127,8 @@
 
     mercurial_intervals = PY_VERSION_COMPATIBILITY.get(python_version, "all()")
 
-    variants = list_mercurial_variants(base_dir)
     hashes = list_mercurial_hashes(base_dir, mercurial_intervals)
     datas = list_data_envs(base_dir)
     benchmarks = list_benchmarks(base_dir)
     for i in range(size):
         h = random.choice(hashes)
@@ -119,8 +130,9 @@
     hashes = list_mercurial_hashes(base_dir, mercurial_intervals)
     datas = list_data_envs(base_dir)
     benchmarks = list_benchmarks(base_dir)
     for i in range(size):
         h = random.choice(hashes)
+        variants = list_mercurial_variants(base_dir, h)
         compatible_datas = [d for d in datas if compatible_with(base_dir, d, h)]
         yield Case(
             h,