correctness fixes, thanks to asan

include/lang2/bitset.h

 
 #include <stdlib.h>
 
-typedef long long int l2_bitset_entry;
+typedef unsigned long long int l2_bitset_entry;
 
 struct l2_bitset {
 	l2_bitset_entry *tables;

lib/vm/vm.c

 			vm->stack[vm->sptr++] = arr_id;
 
 			l2_word ns_id = alloc_val(vm);
+			func = &vm->values[func_id]; // func might be stale after alloc
 			vm->values[ns_id].extra.ns_parent = func->func.namespace;
 			vm->values[ns_id].ns = NULL;
 			vm->values[ns_id].flags = L2_VAL_TYPE_NAMESPACE;

test/build.bx

 files := src ../lib
 includes := snow ../include/lang2
 defines := SNOW_ENABLED
-#sanitizers := address undefined
+sanitizers := address undefined
 cflags := -g

test/src/examples.t.c

 		snow_fail("%s: %s", example_path, err.message);
 	}
 
+	l2_gen_free(&gen);
 	fclose(inf);
 
 	FILE *outf = fopen(example_actual_path, "w");