strange behaviour on creating cell array with canonicalize_file_name()

[Richard Crozier]

I'm seeing the following behaviour on hg id ef5a12a487b9+ (classdef)

> > x = {canonicalize_file_name ('')}
error: Invalid call to canonicalize_file_name.  Correct usage is:

 -- Built-in Function: [CNAME, STATUS, MSG] = canonicalize_file_name
          (FNAME)


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> > x = canonicalize_file_name ('')
x =

Is this expected/reproducible by others? Why can't the output of  
canonicalize_file_name be put in a cell?

Richard

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