From 861527e65d3d16cee69687b579661e6ec1e10748 Mon Sep 17 00:00:00 2001
From: Gregor Kappler <gregor.kappler@bictxt.de>
Date: Thu, 5 Nov 2020 00:47:18 +0100
Subject: [PATCH] Optional: _copy function for copying empty array defaults

---
 src/get.jl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/get.jl b/src/get.jl
index f190c66..17ac43c 100644
--- a/src/get.jl
+++ b/src/get.jl
@@ -152,11 +152,16 @@ function Base.get(parser::Either{<:Trie},
     get(state.state)
 end
 
+_copy(x::Vector) = copy(x)
+_copy(x::AbstractDict) = copy(x)
+_copy(x::AbstractSet) = copy(x)
+_copy(x) = x
+
 function Base.get(parser::Optional,
                   sequence, till,
                   after, i, state)
     if state === None()
-        parser.default
+        _copy(parser.default)
     else
         get(parser.parser,sequence, till, after, i, state)
     end