rhai/doc/src/rust/print-custom.md

Printing for Custom Types

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To use custom types for [print] and [debug], or convert its value into a [string], it is necessary that the following functions 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]
print	|x: &mut T| -> String	x.to_string()	converts the custom type into a [string] for the [print] statement
debug	|x: &mut T| -> String	format!("{:?}", x)	converts the custom type into a [string] for the [debug] statement
+	|s: &str, x: T| -> String	format!("{}{}", s, x)	concatenates the custom type with another [string]
+	|x: &mut T, s: &str| -> String	x.to_string().push_str(s);	concatenates another [string] with the custom type
+=	|s: &mut ImmutableString, x: T|	s += x.to_string()	appends the custom type to an existing [string]