Tests

extendr-macro: Added propogating errors for #92

Job	Run time
ubuntu-latest w/ bindgen (R-devel rust-stable )	1m 46s
windows-latest (R-release rust-stable-msvc)	10m 12s
macOS-latest w/ bindgen (R-devel rust-stable )	5m 13s
windows-latest (R-devel rust-stable-msvc)	10m 54s
windows-latest w/ bindgen (R-release rust-stable-msvc x86_64-pc-windows-gnu)	5m 6s
windows-latest (R-oldrel rust-stable-msvc)	10m 18s
windows-latest w/ bindgen (R-devel rust-stable-msvc x86_64-pc-windows-gnu)	4m 2s
macOS-latest (R-release rust-stable)	8m 19s
windows-latest w/ bindgen (R-release rust-nightly-msvc x86_64-pc-windows-gnu)	4m 38s
ubuntu-latest (R-release rust-stable)	4m 42s
windows-latest w/ bindgen (R-oldrel rust-nightly-msvc x86_64-pc-windows-gnu)	7m 7s
ubuntu-latest (R-release rust-nightly)	6m 14s
ubuntu-latest (R-devel rust-stable)	6m 10s
ubuntu-latest (R-oldrel rust-stable)	1m 15s
	1h 25m 56s

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