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-rw-r--r--lib/pure/collections/critbits.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/collections/critbits.nim b/lib/pure/collections/critbits.nim
index 40a02b651..1fde1f419 100644
--- a/lib/pure/collections/critbits.nim
+++ b/lib/pure/collections/critbits.nim
@@ -131,7 +131,7 @@ proc `[]=`*[T](c: var TCritBitTree[T], key: string, val: T) =
   var n = rawInsert(c, key)
   n.val = val
 
-proc `[]`*[T](c: var TCritBitTree[T], key: string): T {.inline.} =
+proc `[]`*[T](c: TCritBitTree[T], key: string): T {.inline.} =
   ## retrieves the value at ``c[key]``. If `key` is not in `t`,
   ## default empty value for the type `B` is returned
   ## and no exception is raised. One can check with ``hasKey`` whether the key