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Remove redundant assertion near is_char_boundary #38144

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Merged
merged 1 commit into from
Dec 7, 2016
Merged

Remove redundant assertion near is_char_boundary #38144

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4 changes: 0 additions & 4 deletions src/libcollections/string.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1129,8 +1129,6 @@ impl String {
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn insert(&mut self, idx: usize, ch: char) {
let len = self.len();
assert!(idx <= len);
assert!(self.is_char_boundary(idx));
let mut bits = [0; 4];
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It's redundant but it also affects the panic the users sees. The one below is the same, the last one is truly redundant.

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My personal opinion is that in this case, if we wanted a more verbose user error, we should do something like slice_error_fail from libstd/str.rs. Otherwise, it's just an assertion that adds more checks.

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that sounds fair

let bits = ch.encode_utf8(&mut bits).as_bytes();
Expand Down Expand Up @@ -1184,7 +1182,6 @@ impl String {
reason = "recent addition",
issue = "35553")]
pub fn insert_str(&mut self, idx: usize, string: &str) {
assert!(idx <= self.len());
assert!(self.is_char_boundary(idx));

unsafe {
Expand Down Expand Up @@ -1288,7 +1285,6 @@ impl String {
#[unstable(feature = "string_split_off", issue = "38080")]
pub fn split_off(&mut self, mid: usize) -> String {
assert!(self.is_char_boundary(mid));
assert!(mid <= self.len());
let other = self.vec.split_off(mid);
unsafe { String::from_utf8_unchecked(other) }
}
Expand Down