Modules
- module Basic scanning API The core public-facing interface of the library.
 - module Contexts and scanners Lower-level APIs used for scanning individual values.
 - module Format strings Format string description.
 - module Localization Scanning APIs that allow passing in a locale.
 - module Regular expressions
 - module Result types Result and error types.
 - module Scannable sources Description of the 
scannable_rangeandscannable_sourceconcepts. - module Type-erased scanning API Lower-level scanning API with type-erased arguments.
 - module Wide character APIs Scanning interfaces taking wide strings (
wchar_t).