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mtest 0.5.1: the protocol marker survives a link that keeps only what it reaches #2133

Job	Run time
lint	13s
graphics install: no side effects on unrelated members	2m 20s
select	18s
workspace (linux llvm 0/4)	1m 2s
workspace (linux default 0/1)	1m 17s
workspace (linux llvm 3/4)	51s
mirror-cn-reachable	28s
workspace (windows default 0/1)	1m 37s
workspace (macos default 0/1)	1m 16s
workspace (linux llvm 1/4)	59s
workspace (linux llvm 2/4)	45s
installed gRPC template (${{ matrix.platform }})	0s
red members name their issues	8s
timings	5s
full sweep failed — open an issue	0s
	11m 19s