Add test suite files for 4700-4785

I didn't add any test-cases for timing-based bugs (4707, 4768, 4776,
4777, 4779, 4783), nor CoqIDE bugs (4700, 4751, 4752, 4756), nor
bugs about printing (4709, 4711, 4720, 4723, 4734, 4736, 4738, 4741,
4743, 4748, 4749, 4750, 4757, 4758, 4765, 4784).  I'm not sure what to
do with 4712, 4714, 4732, 4740.

1 files changed, 94 insertions, 0 deletions

diff --git a/test-suite/bugs/opened/4781.v b/test-suite/bugs/opened/4781.v
new file mode 100644
index 000000000..8b651ac22
--- /dev/null
+++ b/test-suite/bugs/opened/4781.v
@@ -0,0 +1,94 @@
+Ltac force_clear :=
+  clear;
+  repeat match goal with
+         | [ H : _ |- _ ] => clear H
+         | [ H := _ |- _ ] => clearbody H
+         end.
+
+Class abstract_term {T} (x : T) := by_abstract_term : T.
+Hint Extern 0 (@abstract_term ?T ?x) => force_clear; change T; abstract (exact x) : typeclass_instances.
+
+Goal True.
+(* These work: *)
+  let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  pose x.
+  let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let x := (eval cbv iota in (let v : T := x in v)) in
+  pose x.
+  let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let x := match constr:(Set) with ?y => constr:(y) end in
+  pose x.
+(* This fails with an error: *)
+  Fail let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let x := match constr:(x) with ?y => constr:(y) end in
+  pose x. (* The command has indeed failed with message:
+Error: Variable y should be bound to a term. *)
+(* And the rest fail with Anomaly: Uncaught exception Not_found. Please report. *)
+  Fail let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let x := match constr:(x) with ?y => y end in
+  pose x.
+  Fail let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let x := (eval cbv iota in x) in
+  pose x.
+  Fail let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let x := type of x in
+  pose x. (* should succeed *)
+  Fail let term := constr:(I) in
+  let T := type of term in
+  let x := constr:(_ : abstract_term term) in
+  let x := type of x in
+  pose x. (* should succeed *)
+
+(*Apparently what [cbv iota] doesn't see can't hurt it, and [pose] is perfectly happy with abstracted lemmas only some of the time.
+
+Even stranger, consider:*)
+  let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let y := (eval cbv iota in (let v : T := x in v)) in
+  pose y;
+    let x' := fresh "x'" in
+    pose x as x'.
+      let x := (eval cbv delta [x'] in x') in
+      pose x;
+      let z := (eval cbv iota in x) in
+      pose z.
+
+(*This works fine.  But if I change the period to a semicolon, I get:*)
+
+      Fail let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let y := (eval cbv iota in (let v : T := x in v)) in
+  pose y;
+    let x' := fresh "x'" in
+    pose x as x';
+      let x := (eval cbv delta [x'] in x') in
+      pose x. (* Anomaly: Uncaught exception Not_found. Please report. *)
+ (* should succeed *)
+(*and if I use the second one instead of [pose x] (note that using [idtac] works fine), I get:*)
+
+ Fail  let term := constr:(I) in
+  let T := type of term in
+  let x := constr:((_ : abstract_term term) : T) in
+  let y := (eval cbv iota in (let v : T := x in v)) in
+  pose y;
+    let x' := fresh "x'" in
+    pose x as x';
+      let x := (eval cbv delta [x'] in x') in
+      let z := (eval cbv iota in x) in (* Error: Variable x should be bound to a term. *)
+      idtac. (* should succeed *)