Generates a hashmap of builtin types.
Interpolated string (ie, variable expansion). Any D expression can be placed inside ${ and }. Everything between the curly braces will be evaluated inside your current scope, and passed as a parameter (or parameters) to std.conv.text. The curly braces do NOT nest, so variable expansion will end at the first closing brace. If the closing brace is missing, an Exception will be thrown at compile-time.