elan
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Reuse already downloaded toolchain
Currently, lake/leanpkg doesn't reuse toolchain versions.
How to reproduce
-
elan default leanprover/lean4:nightly
-
lake init foo
which producelean-toolchain
with4.0.0-nightly-2022-07-19
(which is the same version already installed) -
lake build
It's downloading the same nightly version again