If you have multiple modules in a file, you must use a local module declaration for each module. This file would be compiled as if it were written in this manner: module Program For example, consider the following file. If a code file does not begin with a top-level module declaration or a namespace declaration, the whole contents of the file, including any local modules, becomes part of an implicitly created top-level module that has the same name as the file, without the extension, with the first letter converted to uppercase. In a local module declaration, only the declarations that are indented under that module declaration are part of the module. You do have to indent all declarations in local modules. You do not have to indent declarations in a top-level module. The qualified namespace does not have to be previously declared. In the syntax for the top-level module declaration, the optional qualified-namespace is the sequence of nested namespace names that contains the module. A top-level module declaration can appear only as the first declaration in a file. A top-level module declaration includes the whole file in the module. There are two types of module declarations, depending on whether the whole file is included in the module: a top-level module declaration and a local module declaration. It is implemented as a common language runtime (CLR) class that has only static members. Module module-name =Īn F# module is a grouping of F# code constructs such as types, values, function values, and code in do bindings. Grouping code in modules helps keep related code together and helps avoid name conflicts in your program. In the context of the F# language, a module is a grouping of F# code, such as values, types, and function values, in an F# program.

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