rust-lang/rust — pull request #17504 by danburkert (2014-09-24 06:49:28+00:00)
Title: use emit_tuple_arg while serializing tuples

The tuple serialization logic should be using the tuple-specific emit function. This fixes part of #17158. The JSON encoder already proxies to `emit_seq_elt` when `emit_tuple_arg` is called, so this should have an effect.