adding a statement-as-expression test, and returning null from while loops, if asked

lib/coffee_script/nodes.rb

@@ -575,12 +575,13 @@ module CoffeeScript
     end
 
     def compile_node(o)
-      o.delete(:return)
+      returns     = o.delete(:return)
       indent      = o[:indent]
       o[:indent] += TAB
       o[:top]     = true
       cond        = @condition.compile(o)
-      write("#{indent}while (#{cond}) {\n#{@body.compile(o)}\n#{indent}}")
+      post        = returns ? "\n#{indent}return null;" : ''
+      write("#{indent}while (#{cond}) {\n#{@body.compile(o)}\n#{indent}}#{post}")
     end
   end
 

test/fixtures/generation/statements_as_expressions.coffee

@@ -0,0 +1,11 @@
+# Everything should be able to be an expression.
+
+result: while sunny?
+  go_outside()
+
+print(3 + try
+    nonexistent.no_way
+  catch error
+    print(error)
+    3
+)

test/unit/test_execution.rb

@@ -14,8 +14,8 @@ class ExecutionTest < Test::Unit::TestCase
     end
   end
 
-  def test_lintless_coffeescript
-    no_warnings `bin/coffee -l test/fixtures/execution/*.coffee`
+  def test_lintless_tests
+    no_warnings `bin/coffee -l test/fixtures/*/*.coffee`
   end
 
   def test_lintless_examples