download_strategy: fix detect_from_symbol method (#446)

strategy is an undefined variable

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index d63b2e681..4ce3e3412 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -960,7 +960,7 @@ class DownloadStrategyDetector
     when :post    then CurlPostDownloadStrategy
     when :fossil  then FossilDownloadStrategy
     else
-      raise "Unknown download strategy #{strategy} was requested."
+      raise "Unknown download strategy #{symbol} was requested."
     end
   end
 end