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WIP: reintroduce Self types #1659

Job	Run time
Tests / cargo-fmt	24s
Tests / cargo-clippy	40s
Tests / amd64-freebsd-native compiler	2m 39s
Tests / cargo-deny	29s
Tests / amd64-linux-gnu compiler	59s
Tests / amd64-mac-native compiler	1m 21s
Tests / inko-fmt	1m 1s
Tests / amd64-linux-musl compiler	1m 3s
Tests / arm64-mac-native compiler	1m 5s
Tests / amd64-freebsd-native std	4m 14s
Tests / amd64-linux-gnu std --opt=none	1m 40s
Tests / vale	8s
Tests / amd64-mac-native std --opt=none	2m 36s
Tests / amd64-linux-musl std --opt=none	2m 35s
Tests / arm64-mac-native std --opt=none	1m 44s
Tests / amd64-linux-gnu std --opt=balanced	2m 18s
Tests / amd64-linux-musl std --opt=balanced	3m 11s
Tests / amd64-mac-native std --opt=balanced	2m 37s
Tests / arm64-mac-native std --opt=balanced	1m 51s
Standard library documentation	0s
Documentation	0s
Nightly container	0s
	32m 35s

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