Question: Consider a language like Ada or Modula-2, in which a module M can be divided into a specification (header) file and an implementation (body) file

Consider a language like Ada or Modula-2, in which a module M can be divided into a specification (header) file and an implementation (body) file for the purpose of separate compilation. Should M’s specification itself be separately compiled, or should the compiler simply read it in the process of compiling M’s body and the bodies of other modules that use abstractions defined in M? If the specification is compiled, what should the output consist of?

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