[swift-dev] Compile an old version of Swift from source

[Daniel Martín via swift-dev]

What's the easiest way to compile a 2.2.x version of Swift from source? 
AFAIK there's no clear way to know which ref you have to checkout from 
Swift dependency repos, like LLVM or Swift-Clang, because there's not a 
standard tag naming for release versions across repositories.

Thank you,
Daniel
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