fix: remove old line

Author: BobTheBuidler

mypyc/irbuild/for_helpers.py

@@ -240,7 +240,6 @@ def sequence_from_generator_preallocate_helper(
         if isinstance(rtype, RTuple):
             # If input is RTuple, box it to tuple_rprimitive for generic iteration
             # TODO: this can be optimized a bit better with an unrolled ForRTuple helper
-            sequence = builder.coerce(sequence, tuple_rprimitive, line, force=True)
             items = [builder.add(TupleGet(sequence, i, line)) for i in range(len(rtype.types))]
             sequence = builder.new_tuple(items, line)