what defines the gcc array range notation "..."?

["Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx>]

  i notice, in the linux kernel source, numerous array initializers of
the form:

  { [ 0 ... whatever] = 0 ; }

or something similar.  i'm aware of the gcc extension to support
ranges in *case* statements, but i'm not aware of where the *array*
range syntax is defined.

  i don't see it as an official C99 feature, and it's not listed in
the gcc manual as an extension.  so where does it come from?  thanks.

rday