Add resilience against Ruby implementations that don't support Proc#t…

…o_s correctly (IronRuby)

lib/cucumber/core_ext/proc.rb

@@ -6,6 +6,37 @@ module CoreExt
     # Proc extension that allows a proc to be called in the context of any object.
     # Also makes it possible to tack a name onto a Proc.
     module CallIn
+      PROC_PATTERN = /[\d\w]+@(.*):(.*)>/
+
+      if Proc.new{}.to_s =~ PROC_PATTERN
+        def to_backtrace_line
+          "#{file_colon_line}:in `#{name}'"
+        end
+
+        def to_comment_line
+          "# #{file_colon_line}"
+        end
+
+        def file_colon_line
+          path, line = *to_s.match(PROC_PATTERN)[1..2]
+          path = File.expand_path(path)
+          pwd = Dir.pwd
+          path = path[pwd.length+1..-1]
+          "#{path}:#{line}"
+        end
+      else
+        # This Ruby implementation doesn't implement Proc#to_s correctly
+        STDERR.puts "*** THIS RUBY IMPLEMENTATION DOESN'T REPORT FILE AND LINE FOR PROCS ***"
+
+        def to_backtrace_line
+          nil
+        end
+
+        def to_comment_line
+          ""
+        end
+      end
+
       attr_accessor :name
 
       def call_in(obj, *args)
@@ -22,22 +53,6 @@ def arity2
         arity == -1 ? 0 : arity
       end
 
-      def to_backtrace_line
-        "#{file_colon_line}:in `#{name}'"
-      end
-
-      def to_comment_line
-        "# #{file_colon_line}"
-      end
-
-      def file_colon_line
-        path, line = *to_s.match(/[\d\w]+@(.*):(.*)>/)[1..2]
-        path = File.expand_path(path)
-        pwd = Dir.pwd
-        path = path[pwd.length+1..-1]        
-        "#{path}:#{line}"
-      end
-
       def meth
         @meth ||= "__cucumber_#{object_id}"
       end

lib/cucumber/formatters/ansicolor.rb

@@ -3,7 +3,6 @@
 jruby     = defined?(JRUBY_VERSION)
 win       = Config::CONFIG['host_os'] =~ /mswin|mingw/
 ironruby  = Config::CONFIG['sitedir'] =~ /IronRuby/
-wincolour =
 
 gem 'term-ansicolor' unless ironruby # Rubygems don't work here yet.
 # Hack to work around Win32/Console, which bundles a licence-violating, outdated