Moved negative indexing operator here
Only used here (not in standard library)
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@ -948,6 +948,9 @@ proc add*(father, son: PNode) =
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proc `[]`*(n: PNode, i: int): PNode {.inline.} =
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result = n.sons[i]
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template `-|`*(b, s: expr): expr =
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(if b >= 0: b else: s.len + b)
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# son access operators with support for negative indices
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template `{}`*(n: PNode, i: int): expr = n[i -| n]
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template `{}=`*(n: PNode, i: int, s: PNode): stmt =
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