While resolving typeclass evars in clenv, touch only the ones that appear in the

clenv's value and type, ensuring we don't try to solve unrelated
goals (fixes bug#3633).

1 files changed, 21 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/3633.v b/test-suite/bugs/closed/3633.v
new file mode 100644
index 0000000000..6f89ef6db7
--- /dev/null
+++ b/test-suite/bugs/closed/3633.v
@@ -0,0 +1,21 @@
+Set Typeclasses Strict Resolution.
+Class Contr (A : Type) := { center : A }.
+Definition foo {A} `{Contr A} : A.
+Proof.
+  apply center.
+  Undo.
+  (* Ensure the constraints are solved indepentently, otherwise a frozen ?A 
+  makes a search for Contr ?A fail when finishing to apply (fun x => x) *)
+  apply (fun x => x), center. 
+
+(* Toplevel input, characters 7-17:
+Error:
+Unable to satisfy the following constraints:
+In environment:
+A : Type
+H : Contr A
+
+?A : "Type"
+?Contr : "Contr ?X8"
+
+ *)
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