No spurious error due to Interrupt during curl

Only delete the file that is downloaded if an error occurs while downloading it.

Library/Contributions/brew_bash_completion.sh

@@ -1,9 +1,7 @@
 # This script contains bash completions for brew.
+#
 # To use, edit your .bashrc and add the line:
 #   source `brew --prefix`/Library/Contributions/brew_bash_completion.sh
-#
-# Assuming you have brew installed in /usr/local, then you'll want:
-#   source /usr/local/Library/Contributions/brew_bash_completion.sh
 
 _brew_to_completion()
 {

Library/Homebrew/download_strategy.rb

@@ -37,14 +37,16 @@ class HttpDownloadStrategy <AbstractDownloadStrategy
       @dl=HOMEBREW_CACHE+File.basename(@url)
     end
     unless @dl.exist?
-      curl @url, '-o', @dl
+      begin
+        curl @url, '-o', @dl
+      rescue
+        @dl.unlink
+        raise
+      end
     else
       puts "File already downloaded and cached"
     end
     return @dl # thus performs checksum verification
-  rescue Exception
-    @dl.unlink
-    raise "There was an error downloading the file:\n#{@url}"
   end
   def stage
     case `file -b #{@dl}`