Rpc.head.id: def of ezmcp@0.1.0.0
Import: import ezmcp@0.1.0.0/src/rpc.bend as Rpc
Lines 119-122 of ezmcp@0.1.0.0/src/rpc.bend: https://jend.leeeet.dev/read.txt?path=ezmcp@0.1.0.0/src/rpc.bend&start_line=119&end_line=122

import Base
import emerging-ezjson@1.2.0.0/main.bend as Json
import emerging-ezjson@1.2.0.0/src/value.bend as Value

# the id an error reply to a message carries: its own when it has a valid
# one, null otherwise (JSON-RPC 2.0 §5)
def head.id(has_id: Bool, id_ok: Bool, id: Value.Json) -> Value.Json:
  Bool.pick(Value.Json, Bool.and(has_id, id_ok), id, Json.null())

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=emerging-ezjson@1.3.0.0/main.bend&name=null
  https://jend.leeeet.dev/definition.txt?path=emerging-ezjson@1.3.0.0/src/value.bend&name=Json