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-rw-r--r--lib/pure/pegs.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/pegs.nim b/lib/pure/pegs.nim
index b6877696c..d8fed845a 100644
--- a/lib/pure/pegs.nim
+++ b/lib/pure/pegs.nim
@@ -82,7 +82,7 @@ type
     of pkChar, pkGreedyRepChar: ch: char
     of pkCharChoice, pkGreedyRepSet: charChoice: ref set[char]
     of pkNonTerminal: nt: PNonTerminal
-    of pkBackRef..pkBackRefIgnoreStyle: index: range[1..MaxSubpatterns]
+    of pkBackRef..pkBackRefIgnoreStyle: index: range[0..MaxSubpatterns]
     else: sons: seq[TNode]
   PNonTerminal* = ref TNonTerminal