deftype fields tagged ^:unsynchronized-mutable / ^:volatile-mutable can now be reassigned in place from a method, as on the JVM. A jrec stores fields as cons cells, so a new jolt-set-field! mutates the pair with set-cdr!. The deftype macro rewrites (set! mutable-field v) in a method body to (set! (.-field inst) v), and the analyzer compiles a (set! (.-field obj) v) target to jolt-set-field! — so both the rewritten symbol form and an explicit interop (set! (.-root this) v) go through one path. Field reads remain a snapshot at method entry, which is correct for the universal read-then-set pattern (a repeated set! of the same field in one call would read the entry value). Closes the set!-of-local SCI failures: SCI load 202 -> 205/218. |
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