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Add doc for impl From in char_convert
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src/libcore/char/convert.rs

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@@ -115,6 +115,10 @@ pub unsafe fn from_u32_unchecked(i: u32) -> char {
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#[stable(feature = "char_convert", since = "1.13.0")]
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impl From<char> for u32 {
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/// Converts a [`char`] into a [`u32`].
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///
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/// [`char`]: primitive.char.html
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/// [`u32`]: primitive.u32.html
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#[inline]
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fn from(c: char) -> Self {
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c as u32
@@ -141,6 +145,10 @@ impl From<char> for u32 {
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/// C0 and C1 control codes.
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#[stable(feature = "char_convert", since = "1.13.0")]
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impl From<u8> for char {
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/// Converts a [`u8`] into a [`char`].
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///
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/// [`u8`]: primitive.u8.html
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/// [`char`]: primitive.char.html
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#[inline]
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fn from(i: u8) -> Self {
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i as char

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