dont run charlist transforms on higher versions

lib/style/single_node.ex

@@ -32,14 +32,16 @@ defmodule Styler.Style.SingleNode do
 
   def run({node, meta}, ctx), do: {:cont, {style(node), meta}, ctx}
 
-  # Our use of the `literal_encoder` option of `Code.string_to_quoted_with_comments!/2` creates
-  # invalid charlists literal AST nodes from `'foo'`. this rewrites them to use the `~c` sigil
-  # 'foo' => ~c"foo".
-  defp style({:__block__, meta, [chars]} = node) when is_list(chars) do
-    if meta[:delimiter] == "'" do
-      {:sigil_c, Keyword.put(meta, :delimiter, "\""), [{:<<>>, [line: meta[:line]], [List.to_string(chars)]}, []]}
-    else
-      node
+  if Version.match?(System.version(), "< 1.15.0-dev") do
+    # Our use of the `literal_encoder` option of `Code.string_to_quoted_with_comments!/2` creates
+    # invalid charlists literal AST nodes from `'foo'`. this rewrites them to use the `~c` sigil
+    # 'foo' => ~c"foo".
+    defp style({:__block__, meta, [chars]} = node) when is_list(chars) do
+      if meta[:delimiter] == "'" do
+        {:sigil_c, Keyword.put(meta, :delimiter, "\""), [{:<<>>, [line: meta[:line]], [List.to_string(chars)]}, []]}
+      else
+        node
+      end
     end
   end
 

test/style/single_node_test.exs

@@ -11,10 +11,10 @@
 defmodule Styler.Style.SingleNodeTest do
   use Styler.StyleCase, async: true
 
+  # elixir's formatter >= 1.15 does this for us.
   test "charlist literals: rewrites single quote charlists to ~c" do
     assert_style("'foo'", ~s|~c"foo"|)
     assert_style(~s|'"'|, ~s|~c"\\""|)
-    # elixir's formatter >= 1.15 does this for us.
     assert_style("''", ~s|~c""|)
   end