deadcode in generated code

I was doing a bit of housekeeping and noticed this in loggregator:

deadcode: router/internal/server/v2/envelope_traverser.gen.go:20:1: hashBool is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:94:1: _Message_Envelope_Log is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:106:1: ___Message_Envelope_Log_Log is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:123:1: _Message_Envelope_Log_Log is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:146:1: _Message_Envelope_Counter is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:158:1: ___Message_Envelope_Counter_Counter is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:175:1: _Message_Envelope_Counter_Counter is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:198:1: _Message_Envelope_Gauge is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:210:1: ___Message_Envelope_Gauge_Gauge is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:227:1: _Message_Envelope_Gauge_Gauge is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:250:1: _Message_Envelope_Timer is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:262:1: ___Message_Envelope_Timer_Timer is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:279:1: _Message_Envelope_Timer_Timer is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:302:1: _Message_Envelope_Event is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:314:1: ___Message_Envelope_Event_Event is unused
deadcode: router/internal/server/v2/envelope_traverser.gen.go:330:1: _Message_Envelope_Event_Event is unused

It seems to also be in the examples:

deadcode: examples/structs/gen_struct.go:18:1: hashBool is unused
deadcode: examples/structs/gen_struct.go:97:1: _w is unused
deadcode: examples/structs/gen_struct.go:150:1: _x is unused

Start by inspecting router/internal/server/v2/envelope_traverser.gen.go and examples/structs/gen_struct.go, then determine how these generated files are produced. Reproduce the reported deadcode warnings and identify whether the generated output or its source needs changing. Done means the listed unused symbols no longer trigger deadcode warnings in both paths.