Make Ruby warnings visible and reduce warnings.

Author: gkellogg

lib/rdf/model/list.rb

@@ -280,19 +280,6 @@ def *(int_or_str)
       end
     end
 
-    ##
-    # Returns the element at `index`.
-    #
-    # @example
-    #   RDF::List[1, 2, 3][0]                   #=> RDF::Literal(1)
-    #
-    # @param  [Integer] index
-    # @return [RDF::Term]
-    # @see    http://ruby-doc.org/core-2.2.2/Array.html#method-i-5B-5D
-    def [](index)
-      at(index)
-    end
-
     ##
     # Element Assignment — Sets the element at `index`, or replaces a subarray from the `start` index for `length` elements, or replaces a subarray specified by the `range` of indices.
     #

lib/rdf/util/cache.rb

@@ -127,7 +127,7 @@ def initialize(capacity = nil)
       def [](key)
         if (ref = @cache[key])
           if ref.weakref_alive?
-            value = ref.__getobj__ rescue nil
+            ref.__getobj__ rescue nil
           else
             @cache.delete(key)
             nil

lib/rdf/util/uuid.rb

@@ -22,11 +22,11 @@ def self.generate(format: :default)
       begin
         require 'uuid'
         ::UUID.generate(format)
-      rescue LoadError => e
+      rescue LoadError
         begin
           require 'uuidtools'
           ::UUIDTools::UUID.random_create.hexdigest
-        rescue LoadError => e
+        rescue LoadError
           raise LoadError.new("no such file to load -- uuid or uuidtools")
         end
       end

spec/spec_helper.rb

@@ -42,3 +42,5 @@ def fixture_path(filename)
 
 Encoding.default_external = Encoding::UTF_8
 Encoding.default_internal = Encoding::UTF_8
+
+$VERBOSE = true