Python TSG: Error when typed function parameters with splat operator #408

(module [0, 0] - [3, 0]
  (function_definition [0, 0] - [1, 11]
    name: (identifier [0, 4] - [0, 5])
    parameters: (parameters [0, 5] - [0, 20]
      (typed_parameter [0, 6] - [0, 19]
        (dictionary_splat_pattern [0, 6] - [0, 14]
          (identifier [0, 8] - [0, 14]))
        type: (type [0, 16] - [0, 19]
          (identifier [0, 16] - [0, 19]))))
    body: (block [1, 7] - [1, 11]
      (pass_statement [1, 7] - [1, 11]))))

ExecutionError(
  InContext(
    Statement(
    [StatementContext {
      statement: "edge @name.def -> @param.param_name at (853, 3)",
      statement_location: Location { row: 852, column: 2 },
      stanza_location: Location { row: 842, column: 0 },
      source_location: Location { row: 1630, column: 59 },
      node_kind: "typed_parameter" }
    ]),
    InContext(
      Other("Evaluating edge source"),
      UndefinedScopedVariable("[syntax node dictionary_splat_pattern].def"))))