Macro Symbol 

Symbol!() { /* proc-macro */ }

The Symbol! macro is used to create a type-level string through the string literal given to the macro.

The macro constructs the type-level string through a chain of Char types and terminated with the Nil type. In other words, it constructs a type-level list of characters to represent them as a type-level string.

Read more about type-level strings in the documentation for Char.

Example

Given the following symbol definition:

type Hello = Symbol!("hello");

The following type would be generated:

type Hello = Char<'h', Char<'e', Char<'l', Char<'l', Char<'o', Nil>>>>>;

which would be shown with the shortened representation as:

type Hello = ζ<'h', ζ<'e', ζ<'l', ζ<'l', ζ<'o', ε>>>>>;