Fixing issue #700, block comment after first line of class definition.

lib/rewriter.js

@@ -151,6 +151,9 @@
         if (token[0] === ':' && (!last || last[0] !== '{')) {
           stack.push('{');
           idx = this.tag(i - 2) === '@' ? i - 2 : i - 1;
+          if (this.tag(idx - 2) === 'HERECOMMENT') {
+            idx -= 2;
+          }
           tok = ['{', '{', token[2]];
           tok.generated = true;
           this.tokens.splice(idx, 0, tok);

src/rewriter.coffee

@@ -131,6 +131,7 @@ exports.Rewriter = class Rewriter
       if token[0] is ':' and (not last or last[0] isnt '{')
         stack.push '{'
         idx = if @tag(i - 2) is '@' then i - 2 else i - 1
+        idx -= 2 if @tag(idx - 2) is 'HERECOMMENT'
         tok = ['{', '{', token[2]]
         tok.generated = yes
         @tokens.splice idx, 0, tok

test/test_comments.coffee

@@ -154,4 +154,13 @@ class A
   ###
   c: ->
 
-ok A.prototype.c instanceof Function
+ok A.prototype.c instanceof Function
+
+class A
+  ###
+  Comment
+  ###
+  b: ->
+  c: ->
+
+ok A.prototype.b instanceof Function