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Users sometimes run protoc-gen-go directly (rather than via protoc --go_out) and are then confused when it sits and does nothing, waiting for input from stdin. Print an error if any command-line arguments are passed to it. Change-Id: I10a059a82ec71b61c4eb6aeecc1e47e2446feabb Reviewed-on: https://go-review.googlesource.com/c/139877 Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>