Preprocessor Directives

For conditional compilation and setting compiler flags. Symbols are defined in project settings or compiler options

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#if MYSYMBOL
let function1 x y : int = x * y
#else
let function1 x y = x + y
#endif

let result = function1 1 2
printfn "Result: %A" result

#if !DEBUG
printfn "DEBUG not set"
#endif

Line Directives

F# generation code can use this directive to indicate correct line numbers from originating code.

TODO: Need example

Compiler Directives

Enables lightweight syntax. On by default See Verbose syntax for details.

When off (not commonly used) uses keywords begin, end, in to indicate blocks rather than indentation.

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#light "on" // or just `#light`

Compiler Options

Command-line options provided to the compiler. See original language reference for details.

TODO