Symbol package:Agda

Symbols like forall, =, ->, etc.
Parse a Symbol token.
Do a full whnf and treat neutral terms as rigid. Used on the arguments to an injective functions and to the right-hand side. Only returns heads which are stable under interval substitution, i.e. NOT path constructors or generated hcomp/transp!
Pragma String with name QName that is not an Def.