allowing comments in the middle of switch statements

lib/coffee_script/grammar.y

@@ -385,7 +385,7 @@ rule
     LEADING_WHEN Expression Block     { result = IfNode.new(val[1], val[2], nil, {:statement => true}) }
   | LEADING_WHEN Expression Block
       Terminator                      { result = IfNode.new(val[1], val[2], nil, {:statement => true}) }
-  | Comment
+  | Comment Terminator When           { result = val[2].add_comment(val[0]) }
   ;
 
   # The most basic form of "if".

lib/coffee_script/nodes.rb

@@ -769,6 +769,11 @@ module CoffeeScript
       self
     end
 
+    def add_comment(comment)
+      @comment = comment
+      self
+    end
+
     def force_statement
       @tags[:statement] = true
       self
@@ -795,7 +800,7 @@ module CoffeeScript
     # The IfNode only compiles into a statement if either of the bodies needs
     # to be a statement.
     def statement?
-      @is_statement ||= !!(@tags[:statement] || @body.statement? || (@else_body && @else_body.statement?))
+      @is_statement ||= !!(@comment || @tags[:statement] || @body.statement? || (@else_body && @else_body.statement?))
     end
 
     def compile_node(o)
@@ -811,7 +816,9 @@ module CoffeeScript
       o[:indent]  = idt(1)
       o[:top]     = true
       if_dent     = child ? '' : idt
-      if_part     = "#{if_dent}if (#{@condition.compile(cond_o)}) {\n#{Expressions.wrap(@body).compile(o)}\n#{idt}}"
+      com_dent    = child ? idt : ''
+      prefix      = @comment ? @comment.compile(cond_o) + "\n#{com_dent}" : ''
+      if_part     = "#{prefix}#{if_dent}if (#{@condition.compile(cond_o)}) {\n#{Expressions.wrap(@body).compile(o)}\n#{idt}}"
       return if_part unless @else_body
       else_part = chain? ?
         " else #{@else_body.compile(o.merge(:indent => idt, :chain_child => true))}" :

test/fixtures/execution/test_switch.coffee

@@ -7,7 +7,11 @@ result: switch num
     true
     false
   when 10 then true
+
+
+  # Mid-switch comment with whitespace
+  # and multi line
   when 11 then false
   else false
-  
+
 print(result)