Adding support for custom entries in notations.

- New command "Declare Custom Entry bar".
- Entries can have levels.
- Printing is done using a notion of coercion between grammar
  entries. This typically corresponds to rules of the form
  'Notation "[ x ]" := x (x custom myconstr).' but also
  'Notation "{ x }" := x (in custom myconstr, x constr).'.
- Rules declaring idents such as 'Notation "x" := x (in custom myconstr, x ident).'
  are natively recognized.
- Rules declaring globals such as 'Notation "x" := x (in custom myconstr, x global).'
  are natively recognized.

Incidentally merging ETConstr and ETConstrAsBinder.

Noticed in passing that parsing binder as custom was not done as in
constr.

Probably some fine-tuning still to do (priority of notations,
interactions between scopes and entries, ...). To be tested live
further.

1 files changed, 1 insertions, 1 deletions

diff --git a/stm/vernac_classifier.ml b/stm/vernac_classifier.ml
index eca0c6674b..a9a27e8100 100644
--- a/stm/vernac_classifier.ml
+++ b/stm/vernac_classifier.ml
@@ -169,7 +169,7 @@ let classify_vernac e =
     (* These commands alter the parser *)
     | VernacOpenCloseScope _ | VernacDelimiters _ | VernacBindScope _
     | VernacInfix _ | VernacNotation _ | VernacNotationAddFormat _
-    | VernacSyntaxExtension _
+    | VernacSyntaxExtension _ | VernacDeclareCustomEntry _
     | VernacSyntacticDefinition _
     | VernacRequire _ | VernacImport _ | VernacInclude _
     | VernacDeclareMLModule _