Parser exception for multi-list extract/slicing syntax

[aziz-mu]

Currently, slicing/extracting a list of list and then extracting or slicing the results is permitted, if done like so:
MATCH (a:person) RETURN (a:courseScoresPerTerm[1])[1]
however, the following syntax gives a parser error:
MATCH (a:person) RETURN a:courseScoresPerTerm[1][1]

Currently, openCypher supports this syntax so we should too.