Gc.minor ()
x.lzy_string=<not forced> [shared=true]
x.lzy_int=<not forced> [shared=true]
x is setup on major heap

updating fields in x

x.lzy_string=<not forced> [shared=false]
x.lzy_int=<not forced> [shared=false]
forcing x.lzy_str [0.237544] false 250
forcing x.lzy_int [252] false 250
x.lzy_string=0.237544 [shared=false]
x.lzy_int=252 [shared=false]
Gc.minor ()
x.lzy_string=0.237544 [shared=true]
x.lzy_int=252 [shared=true]