Fix String#start_with? implementation

It is supposed to accept a variable number of prefixes, and also to
check if they are convertible to strings. This matches behavior
documented in RubySpec.

1 files changed, 7 insertions, 5 deletions

diff --git a/Library/Homebrew/extend/string.rb b/Library/Homebrew/extend/string.rb
index 1b3c1403e..b2a247297 100644
--- a/Library/Homebrew/extend/string.rb
+++ b/Library/Homebrew/extend/string.rb
@@ -15,12 +15,14 @@ class String
   #               EOS
   alias_method :undent_________________________________________________________72, :undent
 
-  unless String.method_defined?(:start_with?)
-    def start_with? prefix
-      prefix = prefix.to_s
-      self[0, prefix.length] == prefix
+  def start_with?(*prefixes)
+    prefixes.any? do |prefix|
+      if prefix.respond_to?(:to_str)
+        prefix = prefix.to_str
+        self[0, prefix.length] == prefix
+      end
     end
-  end
+  end unless method_defined?(:start_with?)
 
   # String.chomp, but if result is empty: returns nil instead.
   # Allows `chuzzle || foo` short-circuits.