ref --> Unsynchronized.ref tuned.
there are differences in compiling via (1) Build_Isac.thy and via (2) ROOT.ML:
# (1) still accepts ref, while (2) requires Unsynchronized.ref
# (2) is more rigid in type checking (eg. "can't find a fixed record type")
1 ;;; Options for Proof General
3 ;; Examples for sensible settings:
5 (custom-set-variables '(indent-tabs-mode nil))
7 ;(custom-set-variables '(isar-eta-contract nil))
11 ; ((((type x) (class color) (background light)) (:background "lightsteelblue2")))))