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What a framework and its ecosystem library still hit in the engine: t… #1934

Job	Run time
toolchain: gcc (cold self-host)	10m 57s
integration: mcpp builds & runs xlings	10m 0s
build + unit tests (linux x86_64, self-host)	16m 28s
examples: the curriculum builds	11m 39s
toolchain: musl + llvm	10m 18s
	59m 22s