Warn more duplicate literal hash keys

Following non-special_const literals:
* T_REGEXP

1 files changed, 0 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 0b69bc1d7e..e333730935 100644
--- a/parse.y
+++ b/parse.y
@@ -12189,7 +12189,6 @@ hash_literal_key_p(VALUE k)
 {
     switch (OBJ_BUILTIN_TYPE(k)) {
       case T_NODE:
-      case T_REGEXP:
 	return false;
       default:
 	return true;