27.1 The syntax of the foreign declarations

The syntax of foreign clauses is defined by:

<extern> → <variable-clause>
     | <function-clause>
     | <include-clause>
     | <export-clause>
     | <type-clause>

Foreign clauses are automatically “transmitted” by the importation process. That is, if module module1 imports a module module2, module treats the extern clauses of module2 as though they were included in its own module declaration. Redefinition of a variable or a function already defined in an foreign clause is an error.

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