Strip trailing spaces

sample/calc-ja.y

@@ -26,7 +26,7 @@ end
 ---- header
 #
 ---- inner
-  
+
   def evaluate(str)
     @tokens = []
     until str.empty?

sample/calc.y

@@ -24,7 +24,7 @@ end
 ---- header
 #
 ---- inner
-  
+
   def parse(str)
     @q = []
     until str.empty?

sample/hash.y

@@ -7,7 +7,7 @@ class HashParser
 rule
   hash    : '{' contents '}'   { val[1] }
           | '{' '}'            { Hash.new }
-           
+
                   # Racc can handle string over 2 bytes.
   contents: IDENT '=>' IDENT              { {val[0] => val[2]} }
           | contents ',' IDENT '=>' IDENT { val[0][val[2]] = val[4]; val[0] }

sample/syntax.y

@@ -28,7 +28,7 @@ rule
               print 'cba'
             }
         | cont
-  
+
   cont  : A c2 B c2 C
 
   c2    : C C C C C

test/case.rb

@@ -90,8 +90,7 @@ def assert_output_unchanged(asset)
       actual   = File.read("#{@TAB_DIR}/#{file}")
       result   = (strip_version(expected) == strip_version(actual))
 
-      assert(result, "Output of test/assets/#{file}.y differed from " \
-        "expectation. Try compiling it and diff with test/regress/#{file}.")
+      assert(result, proc {`diff -u #{REGRESS_DIR}/#{file} #{@TAB_DIR}/#{file}`})
     end
 
     def racc(*arg, **opt)