diff options
| -rw-r--r-- | library/core/src/char/decode.rs | 2 | ||||
| -rw-r--r-- | library/core/tests/char.rs | 4 |
2 files changed, 5 insertions, 1 deletions
diff --git a/library/core/src/char/decode.rs b/library/core/src/char/decode.rs index 11f1c30f6d5..eeb08803040 100644 --- a/library/core/src/char/decode.rs +++ b/library/core/src/char/decode.rs @@ -67,7 +67,7 @@ impl<I: Iterator<Item = u16>> Iterator for DecodeUtf16<I> { } // all ok, so lets decode it. - let c = (((u - 0xD800) as u32) << 10 | (u2 - 0xDC00) as u32) + 0x1_0000; + let c = (((u & 0x3ff) as u32) << 10 | (u2 & 0x3ff) as u32) + 0x1_0000; // SAFETY: we checked that it's a legal unicode value Some(Ok(unsafe { from_u32_unchecked(c) })) } diff --git a/library/core/tests/char.rs b/library/core/tests/char.rs index 8542e5c70d4..ac0b2ca168b 100644 --- a/library/core/tests/char.rs +++ b/library/core/tests/char.rs @@ -306,6 +306,10 @@ fn test_decode_utf16() { } check(&[0xD800, 0x41, 0x42], &[Err(0xD800), Ok('A'), Ok('B')]); check(&[0xD800, 0], &[Err(0xD800), Ok('\0')]); + check(&[0xD800], &[Err(0xD800)]); + check(&[0xD840, 0xDC00], &[Ok('\u{20000}')]); + check(&[0xD840, 0xD840, 0xDC00], &[Err(0xD840), Ok('\u{20000}')]); + check(&[0xDC00, 0xD840], &[Err(0xDC00), Err(0xD840)]); } #[test] |