From: Charlie Marx <charliemarx@...>
Date: 2009-01-04T03:32:00+09:00
Subject: Re: Ruby 1.8.7: ERB is broken

Actually comments will work in 1.8.7, but only with a specific, more 
limited syntax than shown in the original example above.

Here is a relevant portion from the inline documentation for ERB:

| ERB recognizes certain tags in the provided template and converts them based on the rules below:
| 
|   <% Ruby code -- inline with output %>
|   <%= Ruby expression -- replace with result %>
|   <%# comment -- ignored -- useful in testing %>
|   % a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)
|   %% replaced with % if first thing on a line and % processing is used
|   <%% or %%> -- replace with <% or %> respectively

So comments ARE allowed when the whole embedded expression is a comment, 
i.e.:

<%# this is good comment %>

<% n=1 # this is a bad comment %>

If your 'bad comments' are consistent in their usage of whitespace 
around the hash mark, then it ought to be easy to do a grep 
search-and-replace to change all your bad comments to look like this, 
which WILL work in Ruby 1.8.7:

<% n=1 %><%# this is the fixed comment %>

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