rust / latest / std / char / constant.replacement_character.html

Constant std::char::REPLACEMENT_CHARACTER

pub const REPLACEMENT_CHARACTER: char = char::REPLACEMENT_CHARACTER; // '�'

U+FFFD REPLACEMENT CHARACTER (�) is used in Unicode to represent a decoding error. Use char::REPLACEMENT_CHARACTER instead.

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https://doc.rust-lang.org/std/char/constant.REPLACEMENT_CHARACTER.html