pragma(startaddress) and pragma(mangle)
pragma(startaddress) specifies the start address of the program. Since the start address is normally assigned by the D runtime environment, it is very unlikely that you will ever use this pragma.
pragma(mangle) specifies that a symbol should be name mangled differently from the default name mangling method. Name mangling refers to how the linker identifies functions and their callers. This pragma is useful when D code needs to call a library function that happens to be a D keyword.
For example, if a C library had a function named override because
override happens to be a keyword in D, the only way of calling it from D would be through a different name. However, that different name must still be mangled as the actual function name in the library for the linker to be able to identify it: