Loosen restrictions on mixing universe mono/polymorphism in sections

We disallow adding univ constraints wich refer to polymorphic
universes, and monomorphic constants and inductives when polymorphic
universes or constraints are present.

Every other combination is already correctly discharged by the kernel.

1 files changed, 74 insertions, 0 deletions

diff --git a/test-suite/success/section_poly.v b/test-suite/success/section_poly.v
new file mode 100644
index 0000000000..1e2201f2de
--- /dev/null
+++ b/test-suite/success/section_poly.v
@@ -0,0 +1,74 @@
+
+
+Section Foo.
+
+  Variable X : Type.
+
+  Polymorphic Section Bar.
+
+  Variable A : Type.
+
+  Definition id (a:A) := a.
+
+End Bar.
+Check id@{_}.
+End Foo.
+Check id@{_}.
+
+Polymorphic Section Foo.
+Variable A : Type.
+Section Bar.
+  Variable B : Type.
+
+  Inductive prod := Prod : A -> B -> prod.
+End Bar.
+Check prod@{_}.
+End Foo.
+Check prod@{_ _}.
+
+Section Foo.
+
+  Universe K.
+  Inductive bla := Bla : Type@{K} -> bla.
+
+  Polymorphic Definition bli@{j} := Type@{j} -> bla.
+
+  Definition bloo := bli@{_}.
+
+  Polymorphic Universe i.
+
+  Fail Definition x := Type.
+  Fail Inductive x : Type := .
+  Polymorphic Definition x := Type.
+  Polymorphic Inductive y : x := .
+
+  Variable A : Type. (* adds a mono univ for the Type, which is unrelated to the others *)
+
+  Fail Variable B : (y : Type@{i}).
+  (* not allowed: mono constraint (about a fresh univ for y) regarding
+  poly univ i *)
+
+  Polymorphic Variable B : Type. (* new polymorphic stuff always OK *)
+
+  Variable C : Type@{i}. (* no new univs so no problems *)
+
+  Polymorphic Definition thing := bloo -> y -> A -> B.
+
+End Foo.
+Check bli@{_}.
+Check bloo@{}.
+
+Check thing@{_ _ _}.
+
+Section Foo.
+
+  Polymorphic Universes i k.
+  Universe j.
+  Fail Constraint i < j.
+  Fail Constraint i < k.
+
+  (* referring to mono univs in poly constraints is OK. *)
+  Polymorphic Constraint i < j. Polymorphic Constraint j < k.
+
+  Polymorphic Definition foo := Type@{j}.
+End Foo.