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Update to_uppercase docs to avoid ß->SS example #150902

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Merged
rust-bors merged 3 commits into from
Jan 14, 2026
Merged

Update to_uppercase docs to avoid ß->SS example #150902

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9156b54
Update to_uppercase docs to avoid ß->SS example
guilhermeljs Jan 9, 2026
c10f0dd
Add comment to clarify that 'ffi' is a single Unicode code point mappin…
guilhermeljs Jan 10, 2026
6b5a1a5
Switch from ffi to ſt ligature for better visual clarity
guilhermeljs Jan 12, 2026
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8 changes: 4 additions & 4 deletions library/core/src/char/methods.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1147,7 +1147,7 @@ impl char {
/// As an iterator:
///
/// ```
/// for c in 'ß'.to_uppercase() {
/// for c in 'ffi'.to_uppercase() {

@Noratrieb Noratrieb Jan 10, 2026 •
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Maybe it would make sense to leave a comment explaining that this is a single codepoint? It might be a bit confusing otherwise, as people are likely to not know that these exist (I didn't)

/// print!("{c}");
/// }
/// println!();
Expand All @@ -1156,13 +1156,13 @@ impl char {
/// Using `println!` directly:
///
/// ```
/// println!("{}", 'ß'.to_uppercase());
/// println!("{}", 'ffi'.to_uppercase());
/// ```
///
/// Both are equivalent to:
///
/// ```
/// println!("SS");
/// println!("FFI");
/// ```
///
/// Using [`to_string`](../std/string/trait.ToString.html#tymethod.to_string):
Expand All @@ -1171,7 +1171,7 @@ impl char {
/// assert_eq!('c'.to_uppercase().to_string(), "C");
///
/// // Sometimes the result is more than one character:
/// assert_eq!('ß'.to_uppercase().to_string(), "SS");
/// assert_eq!('ffi'.to_uppercase().to_string(), "FFI");
///
/// // Characters that do not have both uppercase and lowercase
/// // convert into themselves.
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