defines: beta/eta contract lhs; replaced type_syntax by mixfix_type, which handles binders as well;
defines: beta/eta contract lhs;
replaced type_syntax by mixfix_type, which handles binders as well;

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle