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Annotating OCaml Variables and Returns with local_ | OCaml Unboxed

Jane Street
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  • Generalization of current concepts is expected to include local variables within functions and clarify the necessity of local return values.
  • The built-in ignore feature currently lacks awareness of local variables and remains experimental, with ongoing development occurring within Jane Street.
  • While the feature may be available for external experimentation, significant development complexities and "sharp edges" are anticipated.
  • Distinct rules govern the function return slot compared to other contexts; these rules are complex and will be explained in a future session rather than in the current one.
  • Return positions, also referred to as tail positions, are expected to be treated specially by the compiler.
  • A potential compiler bug is predicted where exclave usage without local triggers a type error despite the code functioning correctly, as exclave terminates the associated region early.
  • Future videos are planned to explore interactions between local parameters and local variables, as well as the broader interplay among features such as local and exclave.