Once a file has been lexically analyzed, several kinds of source preprocessing occur. The most important, conditional compilation, determines which source is processed by the syntactic grammar; two other types of directives — external source directives and region directives — provide meta-information about the source but have no effect on compilation.

See Also

3.1 Conditional Compilation | 3.2 External Source Directives | 3.3 Region Directives | Directives (Visual Basic Language Reference)