Parser.parseCastQualifier

Parses a CastQualifier

$(GRAMMAR $(RULEDEF castQualifier): $(LITERAL 'const') | $(LITERAL 'const') $(LITERAL 'shared') | $(LITERAL 'immutable') | $(LITERAL 'inout') | $(LITERAL 'inout') $(LITERAL 'shared') | $(LITERAL 'shared') | $(LITERAL 'shared') $(LITERAL 'const') | $(LITERAL 'shared') $(LITERAL 'inout') ;)