code: def set_bam_fname(variant_call, bam_fname):
      """Sets 'BAM_FNAME' field of the VariantCall."""
      return struct_utils.set_string_field(
          variant_call.info, "BAM_FNAME", bam_fname
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from third_party.nucleus.protos import struct_pb2
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.util import struct_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 15 for calling a global function with example usage: set_bam_fname(variant_call, bam_fname) and returns: struct_utils