Bug in <TAB> readline support

[Ilya Zakharevich <nospam-abuse@ilyaz.org>]

Type

  sp=default(seriesprecision); d
  
and press <TAB>.  The result is

  datadir     debug       debugfiles  debugmem

The expected value is not the list of *default* starting with “d”, but
the list of identifiers starting with d.

Hope this helps,
Ilya

P.S.  BTW, thinking about different case:

      	   After the tick ', should not the <TAB>-expansion be suitable?