elixir-lang/elixir v1.20.0-rc.2 on GitHub

Overall, the compiler finds more bugs, for free, and it has never been faster:

Infers types across clauses, finding more bugs and dead code
Compiles ~10% faster and has a new interpreted mode (up to 5x faster, scales to the number of cores). For more information, follow the benchmarks
Modifying a struct definition recompiles fewer files (it no longer requires files that only pattern match or update structs to recompile)

[Code] Add module_definition: :interpreted option to Code which allows module definitions to be evaluated instead of compiled. In some applications/architectures, this can lead to drastic improvements to compilation times. Note this does not affect the generated .beam file, which will have the same performance/behaviour as before
[Code] Make module purging opt-in and move temporary module deletion to the background to speed up compilation times
[Integer] Add Integer.popcount/1
[Kernel] Move struct validation in patterns and updates to type checker, this means adding and remove struct fields will cause fewer files to be recompiled
[Kernel] Add type inference across clauses. For example, if one clause says x when is_integer(x), then the next clause may no longer be an integer
[Kernel] Detect and warn on redundant clauses
[List] Add List.first!/1 and List.last!/1
Add Software Bill of Materials guide to the Documentation

[mix compile] Add module_definition: :interpreted option to Code which allows module definitions to be evaluated instead of compiled. In some applications/architectures, this can lead to drastic improvements to compilation times. Note this does not affect the generated .beam file, which will have the same performance/behaviour as before
[mix deps] Parallelize dep lock status checks during deps.loadpaths, improving boot times in projects with many git dependencies

map.foo() (accessing a map field with parens) and mod.foo (invoking a function without parens) will now raise instead of emitting runtime warnings, aligning themselves with the type system behaviour

[mix compile.erlang] Topsort Erlang modules before compilation for proper dependency resolution