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A lot of tools use Ripper/RubyVM::AbstractSyntaxTree to determine if a source is valid. These tools both create an AST instead of providing an API that will return a boolean only. This new API only creates the C structs, but doesn't bother reifying them into Ruby/the serialization API. Instead it only returns true/false, which is significantly more efficient. https://github.com/ruby/prism/commit/7014740118