Hello all,

Here's an improved version of the SRFI-105 patch for Guile 2.0.  It
incorporates the recent name change 'nfx' --> '$nfx$', has an improved
test suite, and now correctly handles the case where 'curly-infix' is
enabled but the 'square-brackets' read option is disabled.

This patch assumes that the following patch set (per-port read options
and reader directives) has already been applied:

  http://lists.gnu.org/archive/html/guile-devel/2012-10/msg00056.html

Note that in the interests of backward compatibility, SRFI-105 syntax is
enabled by default, since '{' and '}' are currently considered "extended
alphabetic characters".  It must first be enabled in one of two ways:

* On a per-port basis, when the reader encounters the "#!curly-infix"
  reader directive, e.g. near the top of source files.

* Globally, by evaluating: (read-enable 'curly-infix)

Reviews solicited.

   Thanks,
     Mark