Repository: rust-lang/rust
File: library/core/src/char/mod.rs (Rust)

Code before:
    Ps  Open_Punctuation        an opening punctuation mark (of a pair)
    Pe  Close_Punctuation       a closing punctuation mark (of a pair)
    Pi  Initial_Punctuation     an initial quotation mark
    Pf  Final_Punctuation       a final quotation mark
    Po  Other_Punctuation       a punctuation mark of other type
    Sm  Math_Symbol             a symbol of primarily mathematical use
    Sc  Currency_Symbol         a currency sign
    Sk  Modifier_Symbol         a non-letterlike modifier symbol
    So  Other_Symbol            a symbol of other type
    Zs  Space_Separator         a space character (of various non-zero widths)
    Zl  Line_Separator          U+2028 LINE SEPARATOR only
    Zp  Paragraph_Separator     U+2029 PARAGRAPH SEPARATOR only
    Cc  Control                 a C0 or C1 control code
    Cf  Format                  a format control character
    Cs  Surrogate               a surrogate code point
    Co  Private_Use             a private-use character
    Cn  Unassigned              a reserved unassigned code point or a noncharacter
*/

/// The highest valid code point a `char` can have, `'\u{10FFFF}'`. Use [`char::MAX`] instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX: char = char::MAX;

/// The maximum number of bytes required to [encode](char::encode_utf8) a `char` to
/// UTF-8 encoding.
#[stable(feature = "char_max_len", since = "CURRENT_RUSTC_VERSION")]
pub const MAX_LEN_UTF8: usize = char::MAX_LEN_UTF8;

/// The maximum number of two-byte units required to [encode](char::encode_utf16) a `char`
/// to UTF-16 encoding.
#[stable(feature = "char_max_len", since = "CURRENT_RUSTC_VERSION")]
pub const MAX_LEN_UTF16: usize = char::MAX_LEN_UTF16;

/// `U+FFFD REPLACEMENT CHARACTER` (�) is used in Unicode to represent a
/// decoding error. Use [`char::REPLACEMENT_CHARACTER`] instead.
#[stable(feature = "decode_utf16", since = "1.9.0")]
pub const REPLACEMENT_CHARACTER: char = char::REPLACEMENT_CHARACTER;

/// The version of [Unicode](https://www.unicode.org/) that the Unicode parts of
/// `char` and `str` methods are based on. Use [`char::UNICODE_VERSION`] instead.
#[stable(feature = "unicode_version", since = "1.45.0")]
pub const UNICODE_VERSION: (u8, u8, u8) = char::UNICODE_VERSION;

/// Creates an iterator over the UTF-16 encoded code points in `iter`, returning
/// unpaired surrogates as `Err`s. Use [`char::decode_utf16`] instead.
#[stable(feature = "decode_utf16", since = "1.9.0")]
#[inline]
pub fn decode_utf16<I: IntoIterator<Item = u16>>(iter: I) -> DecodeUtf16<I::IntoIter> {
    self::decode::decode_utf16(iter)
}


Review comment (suggestion):
In the FCP we decided to only stabilize the associated constants, not the constants in the `core::char` module.

Code after:
    Ps  Open_Punctuation        an opening punctuation mark (of a pair)
    Pe  Close_Punctuation       a closing punctuation mark (of a pair)
    Pi  Initial_Punctuation     an initial quotation mark
    Pf  Final_Punctuation       a final quotation mark
    Po  Other_Punctuation       a punctuation mark of other type
    Sm  Math_Symbol             a symbol of primarily mathematical use
    Sc  Currency_Symbol         a currency sign
    Sk  Modifier_Symbol         a non-letterlike modifier symbol
    So  Other_Symbol            a symbol of other type
    Zs  Space_Separator         a space character (of various non-zero widths)
    Zl  Line_Separator          U+2028 LINE SEPARATOR only
    Zp  Paragraph_Separator     U+2029 PARAGRAPH SEPARATOR only
    Cc  Control                 a C0 or C1 control code
    Cf  Format                  a format control character
    Cs  Surrogate               a surrogate code point
    Co  Private_Use             a private-use character
    Cn  Unassigned              a reserved unassigned code point or a noncharacter
*/

/// The highest valid code point a `char` can have, `'\u{10FFFF}'`. Use [`char::MAX`] instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX: char = char::MAX;

/// The maximum number of bytes required to [encode](char::encode_utf8) a `char` to
/// UTF-8 encoding.
#[unstable(feature = "char_max_len", issue = "121714")]
pub const MAX_LEN_UTF8: usize = char::MAX_LEN_UTF8;

/// The maximum number of two-byte units required to [encode](char::encode_utf16) a `char`
/// to UTF-16 encoding.
#[unstable(feature = "char_max_len", issue = "121714")]
pub const MAX_LEN_UTF16: usize = char::MAX_LEN_UTF16;

/// `U+FFFD REPLACEMENT CHARACTER` (�) is used in Unicode to represent a
/// decoding error. Use [`char::REPLACEMENT_CHARACTER`] instead.
#[stable(feature = "decode_utf16", since = "1.9.0")]
pub const REPLACEMENT_CHARACTER: char = char::REPLACEMENT_CHARACTER;

/// The version of [Unicode](https://www.unicode.org/) that the Unicode parts of
/// `char` and `str` methods are based on. Use [`char::UNICODE_VERSION`] instead.
#[stable(feature = "unicode_version", since = "1.45.0")]
pub const UNICODE_VERSION: (u8, u8, u8) = char::UNICODE_VERSION;

/// Creates an iterator over the UTF-16 encoded code points in `iter`, returning
/// unpaired surrogates as `Err`s. Use [`char::decode_utf16`] instead.
#[stable(feature = "decode_utf16", since = "1.9.0")]
#[inline]
pub fn decode_utf16<I: IntoIterator<Item = u16>>(iter: I) -> DecodeUtf16<I::IntoIter> {
    self::decode::decode_utf16(iter)
}