The live range of the wasm instance created by JS Generator is global, likes:

let $1 = instance(...);
assert...($1, ...);
let $2 = instance(...);
assert...($2, ...);

Tests such as memory_copy.wast and memory_init.wast, usually contain many instances. When executing these tests on some machines, out of memory fails may be reported.

Can you add a scope to each instance so that they are destroyed after use ?