test

Implement `Deref` for COM interface hierarchies in `windows-bindgen` #2203

Job	Run time
Test (stable, x86_64-pc-windows-msvc)	16m 46s
Test (nightly, i686-pc-windows-msvc)	23m 15s
Test (nightly, x86_64-pc-windows-gnu)	21m 50s
Test (stable, i686-pc-windows-gnu)	23m 4s
	1h 24m 55s

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