Collapse begin..end into def..end and use else clause

Library/Homebrew/resource.rb

@@ -76,14 +76,13 @@ class Resource
 
   # For brew-fetch and others.
   def fetch
-    begin
-      # Ensure the cache exists
-      HOMEBREW_CACHE.mkpath
-      downloader.fetch
-      cached_download
-    rescue ErrorDuringExecution, CurlDownloadStrategyError => e
-      raise DownloadError.new(downloader.name)
-    end
+    # Ensure the cache exists
+    HOMEBREW_CACHE.mkpath
+    downloader.fetch
+  rescue ErrorDuringExecution, CurlDownloadStrategyError => e
+    raise DownloadError.new(downloader.name)
+  else
+    cached_download
   end
 
   def verify_download_integrity fn