Replace the subtype check for the map composition with the
comparability check.
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
added abstract list matching for concrete lists, but commented out.
Merge branch 'master' of git@github.com:cwi-swat/rascal.git
added support for abstract patterns that match with concrete trees in
switch
cases
merged