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POWhy can't I evaluate this OCaml line with tuareg mode's C-c C-e command?
 

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  1. POWhy can't I evaluate this OCaml line with tuareg mode's C-c C-e command?
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    <p>Background: I'm using Emacs 23.3, OCaml 3.12.0 and tuareg 1.45.7. </p> <p>I'm looking at the <a href="http://www.cs.caltech.edu/courses/cs134/cs134b/book.pdf" rel="nofollow">Hickey OCaml book</a>, and trying to run the examples on pg. 157 of the book, 167 of the .pdf. The problem arises with the expression</p> <pre><code>type ’a blob = &lt; draw : unit; .. &gt; as ’a </code></pre> <p>When I type that into my emacs buffer in tuareg-mode, and try to evaluate it with <code>C-c C-e</code>, I get the following error in the caml toplevel:</p> <pre><code># type 'a blob = &lt; draw : unit; .. &gt; as ';; Characters 39-41: type 'a blob = &lt; draw : unit; .. &gt; as ';; ^^ Error: Syntax error </code></pre> <p>Notice how the final <code>a</code> doesn't appear in command sent to the toplevel. If I type the line into the toplevel directly, it works just fine:</p> <pre><code># type 'a blob = &lt; draw : unit; .. &gt; as 'a;; type 'a blob = 'a constraint 'a = &lt; draw : unit; .. &gt; </code></pre> <p>So my question is: Why doesn't this work, and how can I fix it? Updating tuareg doesn't seem to be an option: I've tried to use tuareg version 2.0, but that won't even load properly. </p> <p><strong>Update</strong>: This was fixed in the tuareg SVN trunk as of 12/8/12. I don't think they've updated the release with the fix, but you can grab the trunk anonymously with</p> <pre><code>svn checkout svn://svn.forge.ocamlcore.org/svn/tuareg/trunk </code></pre> <p>bearing in mind the usual caveats about development vs. release versions. </p>
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