Names.Group.add.of: def of bend-lint-api@0.2.0.0
Import: import bend-lint-api@0.2.0.0/shared/names.bend as Names
Lines 39-50 of bend-lint-api@0.2.0.0/shared/names.bend: https://jend.leeeet.dev/read.txt?path=bend-lint-api@0.2.0.0/shared/names.bend&start_line=39&end_line=50

import Base

# Groups
# ======
# Values by name, in a map: each name's values, last first.
def Group.add.of(
  -A: Data,
  got: Map<&2, List<&2, A>> & List<&2, A>,
  key: String,
  x: A
) -> Map<&2, List<&2, A>>:
  match got:
    case Tuple{groups, old}:
      Map.set(&2, List<&2, A>, groups, key, x <> old)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Map
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Map.set
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String