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use crate::rust::prelude::*;
use crate::traversal::*;
use crate::*;

pub trait CustomDisplayContext<'a>: Default + Copy {
    type CustomExtension: FormattableCustomExtension<CustomDisplayContext<'a> = Self>;
}

pub trait FormattableCustomExtension: CustomExtension + Copy {
    type CustomDisplayContext<'a>: CustomDisplayContext<'a>;

    /// The gives the inner formatted representation of the value.
    /// This function should write the value content to the formatter.
    ///
    /// * The rust-like representaiton is as a newtytpe: CustomValueKind(<value_content>)
    /// * The nested string representation is identical: CustomValueKind(<value_content>)
    fn display_string_content<'s, 'de, 'a, 't, 's1, 's2, F: fmt::Write>(
        f: &mut F,
        context: &Self::CustomDisplayContext<'a>,
        value: &<Self::CustomTraversal as CustomTraversal>::CustomTerminalValueRef<'de>,
    ) -> Result<(), fmt::Error>;
}