2 files changed, 15 insertions, 0 deletions
diff --git a/test-suite/bugs/closed/3974.v b/test-suite/bugs/closed/3974.v
new file mode 100644
index 0000000000..b6be159595
--- /dev/null
+++ b/test-suite/bugs/closed/3974.v
@@ -0,0 +1,7 @@
+Module Type S.
+End S.
+
+Module Type M (X : S).
+  Fail Module P (X : S).
+  (* Used to say: Anomaly: X already exists. Please report. *)
+  (* Should rather say now: Error: X already exists. *)
+\ No newline at end of file
diff --git a/test-suite/bugs/closed/3975.v b/test-suite/bugs/closed/3975.v
new file mode 100644
index 0000000000..95851c8137
--- /dev/null
+++ b/test-suite/bugs/closed/3975.v
@@ -0,0 +1,8 @@
+Module Type S. End S.
+
+Module M (X:S). End M.
+
+Module Type P (X : S).
+  Print M.
+  (* Used to say: Anomaly: X already exists. Please report. *)
+  (* Should rather : print something :-) *)
+\ No newline at end of file