Merge PR #13417: Use nat_or_var in grammar where negative values don't make sense

Reviewed-by: Zimmi48

1 files changed, 4 insertions, 2 deletions

diff --git a/doc/sphinx/proofs/writing-proofs/rewriting.rst b/doc/sphinx/proofs/writing-proofs/rewriting.rst
index 5283f60b11..9ec568c2c7 100644
--- a/doc/sphinx/proofs/writing-proofs/rewriting.rst
+++ b/doc/sphinx/proofs/writing-proofs/rewriting.rst
@@ -323,10 +323,12 @@ Performing computations
    | delta {? @delta_flag }
    ref_or_pattern_occ ::= @reference {? at @occs_nums }
    | @one_term {? at @occs_nums }
-   occs_nums ::= {+ {| @natural | @ident } }
-   | - {+ {| @natural | @ident } }
+   occs_nums ::= {+ @nat_or_var }
+   | - {+ @nat_or_var }
    int_or_var ::= @integer
    | @ident
+   nat_or_var ::= @natural
+   | @ident
    unfold_occ ::= @reference {? at @occs_nums }
    pattern_occ ::= @one_term {? at @occs_nums }