| sk = fs ', is_reftype(fs .type), validref(str, r, ty, st), validref(str, val .refval, fs .type, st), is_fskey(sk), is_referencevalue(val) ⊦ validref(str, r, ty, st[r0 -- sk, val]) |
is_reftype(fs .type), validref(str, r, ty, st), validref(str, val .refval, fs .type, st), is_referencevalue(val) ⊦ validref(str, r, ty, st[r0 -- fs ', val])
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_fskey(fs ')])]]