isSymOcc (OccName DataName s) = isLexConSym s
isSymOcc (OccName TcClsName s) = isLexConSym s
isSymOcc (OccName VarName s) = isLexSym s
isSymOcc (OccName DataName s) = isLexConSym s
isSymOcc (OccName TcClsName s) = isLexConSym s
isSymOcc (OccName VarName s) = isLexSym s