This: cat > foo.rb <<'EOF' module Foo File.open('oops', 'wb') { |f| f << "hello\n" } end EOF srb rbi init ls -1 oops # => oops It's not

This: cat > foo.rb <<'EOF' module Foo File.open('oops', 'wb') { |f| f << "hello\n" } end EOF srb rbi init ls -1 oops # => oops It's not even about malicious code, it's about blanket eval'ing a whole tree of rb files, which may contain anything from mistakes to legit but side-effectful code. Neither of those have such side effects: rbs prototype rb foo.rb rbs prototype rbi foo.rb typeprof foo.rb