std::str: Only check char boundary for end index in .slice_to()

blake2-ppc · blake2-ppc · commit 8931ad9e52e4 · 2013-08-19T11:20:00.000+02:00
diff --git a/src/libstd/str.rs b/src/libstd/str.rs
@@ -1427,7 +1427,8 @@ impl<'self> StrSlice<'self> for &'self str {
     /// out of bounds.
     #[inline]
     fn slice_to(&self, end: uint) -> &'self str {
-        self.slice(0, end)
+        assert!(self.is_char_boundary(end));
+        unsafe { raw::slice_bytes(*self, 0, end) }
     }
 
     /// Returns a slice of the string from the char range

Original file line number	Diff line number	Diff line change
`@@ -1427,7 +1427,8 @@ impl<'self> StrSlice<'self> for &'self str {`
`1427`	`1427`	`/// out of bounds.`
`1428`	`1428`	`#[inline]`
`1429`	`1429`	`fn slice_to(&self, end: uint) -> &'self str {`
`1430`		`- self.slice(0, end)`
	`1430`	`+ assert!(self.is_char_boundary(end));`
	`1431`	`+ unsafe { raw::slice_bytes(*self, 0, end) }`
`1431`	`1432`	`}`
`1432`	`1433`
`1433`	`1434`	`/// Returns a slice of the string from the char range`