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-rw-r--r--vernac/metasyntax.ml3
1 files changed, 2 insertions, 1 deletions
diff --git a/vernac/metasyntax.ml b/vernac/metasyntax.ml
index 7c1a880c46..67506a2551 100644
--- a/vernac/metasyntax.ml
+++ b/vernac/metasyntax.ml
@@ -1229,7 +1229,8 @@ let compute_syntax_data df modifiers =
let msgs,n = find_precedence mods.custom mods.level mods.etyps symbols onlyprint in
let custom = make_custom_entry mods.custom n in
let ntn_for_interp = make_notation_key custom symbols in
- let symbols_for_grammar = remove_curly_brackets symbols in
+ let symbols_for_grammar =
+ if custom = InConstrEntrySomeLevel then remove_curly_brackets symbols else symbols in
let need_squash = not (List.equal Notation.symbol_eq symbols symbols_for_grammar) in
let ntn_for_grammar = if need_squash then make_notation_key custom symbols_for_grammar else ntn_for_interp in
if mods.custom = InConstrEntry && not onlyprint then check_rule_productivity symbols_for_grammar;