val gen_of_size :
int QCheck2.Gen.t->Map.keyQCheck2.Gen.t->'vQCheck2.Gen.t->'vMap.tQCheck2.Gen.t
gen_of_size size_gen key_gen val_gen is a generator of Map where the keys are generated with key_gen and the values with val_gen. The number of entries in the map is decided by size_gen.
val gen : Map.keyQCheck2.Gen.t->'vQCheck2.Gen.t->'vMap.tQCheck2.Gen.t
gen key_gen gen_gen is a generator of Map where the keys are generated with key_gen and the values with val_gen.