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`ProxyPad::chain_default` requires type annotations

I am getting a build error like:

error[E0283]: type annotations required: cannot resolve `_: glib::IsA<gst::Object>`
  --> gst-plugin-tutorial/src/progressbin.rs:51:13
   |
51 |             gst::ProxyPad::chain_default(pad, parent, buffer)
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: required by `gst::proxy_pad::<impl gst::ProxyPad>::chain_default

when trying to use gst::ProxyPad::chain_default with the given parameters of the set_chain_function callback, for example, modifying the existing gst-plugin-tutorial/src/progressbin.rs tutorial with the attached patch.progressbin.diff

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