Printing for Custom Types

Provide These Functions

To use custom types for print and debug, or convert a custom type into a string, it is necessary that the following functions, at minimum, be registered (assuming the custom type is T: Display + Debug).

Function	Signature	Typical implementation	Usage
`to_string`	`\|x: &mut T\| -> String`	`x.to_string()`	converts the custom type into a string
`to_debug`	`\|x: &mut T\| -> String`	`format!("{x:?}")`	converts the custom type into a string in debug format

Tip: #[rhai_fn(global)]

If these functions are defined via a plugin module, be sure to include the #[rhai_fn(global)] attribute in order to make them available globally.

See this section for more details.

The following functions are implemented using to_string or to_debug by default, but can be overloaded with custom versions.

Function	Signature	Default	Usage
`print`	`\|x: &mut T\| -> String`	`to_string`	converts the custom type into a string for the `print` statement
`debug`	`\|x: &mut T\| -> String`	`to_debug`	converts the custom type into a string for the `debug` statement
`+` operator	`\|s: &str, x: T\| -> String`	`to_string`	concatenates the custom type with another string
`+` operator	`\|x: &mut T, s: &str\| -> String`	`to_string`	concatenates another string with the custom type
`+=` operator	`\|s: &mut ImmutableString, x: T\|`	`to_string`	appends the custom type to an existing string