1 #[cfg(no_str_strip_prefix)] // rustc <1.45
2 pub(crate) trait StripPrefixExt {
strip_prefix(&self, ch: char) -> Option<&str>3     fn strip_prefix(&self, ch: char) -> Option<&str>;
4 }
5 
6 #[cfg(no_str_strip_prefix)]
7 impl StripPrefixExt for str {
strip_prefix(&self, ch: char) -> Option<&str>8     fn strip_prefix(&self, ch: char) -> Option<&str> {
9         if self.starts_with(ch) {
10             Some(&self[ch.len_utf8()..])
11         } else {
12             None
13         }
14     }
15 }
16 
17 pub(crate) use crate::alloc::vec::Vec;
18 
19 #[cfg(no_alloc_crate)] // rustc <1.36
20 pub(crate) mod alloc {
21     pub use std::alloc;
22     pub use std::vec;
23 }
24