Recurse when tracing an iso that has become a val
Recurse when tracing an iso that has become a val

Force `mutability` to trigger recursion.

dipinhora/ponyc,sgebbie/ponyc,jemc/ponyc,boemmels/ponyc,jupvfranco/ponyc,kulibali/ponyc,boemmels/ponyc,Perelandric/ponyc,Perelandric/ponyc,Perelandric/ponyc,kulibali/ponyc,jupvfranco/ponyc,Praetonus/ponyc,jemc/ponyc,Praetonus/ponyc,sgebbie/ponyc,Perelandric/ponyc,ponylang/ponyc,sgebbie/ponyc,boemmels/ponyc,ponylang/ponyc,Theodus/ponyc,mkfifo/ponyc,mkfifo/ponyc,jupvfranco/ponyc,cquinn/ponyc,cquinn/ponyc,boemmels/ponyc,jupvfranco/ponyc,cquinn/ponyc,ponylang/ponyc,mkfifo/ponyc,kulibali/ponyc,dipinhora/ponyc,Theodus/ponyc,mkfifo/ponyc,jemc/ponyc,dipinhora/ponyc,Praetonus/ponyc,Theodus/ponyc,Perelandric/ponyc,Theodus/ponyc,mkfifo/ponyc,CausalityLtd/ponyc,CausalityLtd/ponyc,jupvfranco/ponyc,Theodus/ponyc,Praetonus/ponyc,cquinn/ponyc,sgebbie/ponyc,boemmels/ponyc,sgebbie/ponyc,kulibali/ponyc,CausalityLtd/ponyc