first support for properties in where clauses at definition sites; this works for simple properties, but not for matches or cascading property calculations in where clauses.
first support for properties in where clauses at definition sites; this works for simple properties, but not for matches or cascading property calculations in where clauses.

svn path=/spoofax-imp/branches/nbl-dev/; revision=26002

metaborg/nabl,metaborg/nabl,metaborg/nabl