Enable show-source for procs stored in constants

lib/pry/default_commands/introspection.rb

@@ -28,7 +28,7 @@ class Pry
       def input_type(input,target)
         if input == ""
           :blank
-        elsif target.eval("defined? #{input} ") =~ /variable/ &&
+        elsif target.eval("defined? #{input} ") =~ /variable|constant/ &&
               target.eval(input).respond_to?(:source_location)
           :sourcable_object
         elsif Pry::Method.from_str(input,target)
@@ -137,7 +137,7 @@ class Pry
           opt.on :f, :flood, "Do not use a pager to view text longer than one screen."
           opt.on :a, :all, "Show docs for all definitions and monkeypatches of the module/class"
         end
-        
+
         def process_sourcable_object
           name = args.first
           object = target.eval(name)

test/test_default_commands/test_show_source.rb

@@ -206,11 +206,17 @@ if !mri18_and_no_real_source_location?
         end
       end
 
-      it "should output source for procs/lambdas" do
+      it "should output source for procs/lambdas stored in variables" do
         hello = proc { puts 'hello world!' }
         mock_pry(binding, "show-source hello").should =~ /proc { puts 'hello world!' }/
       end
 
+      it "should output source for procs/lambdas stored in constants" do
+        HELLO = proc { puts 'hello world!' }
+        mock_pry(binding, "show-source HELLO").should =~ /proc { puts 'hello world!' }/
+        Object.remove_const(:HELLO)
+      end
+
       it "should output source for method objects" do
         def @o.hi; puts 'hi world'; end
         meth = @o.method(:hi)