roll back

en/src/lifetime/advance.md

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-# advance

en/src/lifetime/basic.md

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-## 生命周期消除
-
-```rust
-fn print(s: &str);                                      // elided
-fn print<'a>(s: &'a str);                               // expanded
-
-fn debug(lvl: usize, s: &str);                          // elided
-fn debug<'a>(lvl: usize, s: &'a str);                   // expanded
-
-fn substr(s: &str, until: usize) -> &str;               // elided
-fn substr<'a>(s: &'a str, until: usize) -> &'a str;     // expanded
-
-fn get_str() -> &str;                                   // ILLEGAL
-
-fn frob(s: &str, t: &str) -> &str;                      // ILLEGAL
-
-fn get_mut(&mut self) -> &mut T;                        // elided
-fn get_mut<'a>(&'a mut self) -> &'a mut T;              // expanded
-
-fn args<T: ToCStr>(&mut self, args: &[T]) -> &mut Command                  // elided
-fn args<'a, 'b, T: ToCStr>(&'a mut self, args: &'b [T]) -> &'a mut Command // expanded
-
-fn new(buf: &mut [u8]) -> BufWriter;                    // elided
-fn new(buf: &mut [u8]) -> BufWriter<'_>;                // elided (with `rust_2018_idioms`)
-fn new<'a>(buf: &'a mut [u8]) -> BufWriter<'a>          // expanded
-```

en/src/lifetime/intro.md

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-# Lifetime

en/src/lifetime/static.md

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-# &'static and T: 'static
-
-```rust,editable
-use std::fmt::Display;
-
-fn main() {
-  let mut string = "First".to_owned();
-
-  string.push_str(string.to_uppercase().as_str());
-  print_a(&string);
-  print_b(&string);
-  print_c(&string); // Compilation error
-  print_d(&string); // Compilation error
-  print_e(&string);
-  print_f(&string);
-  print_g(&string); // Compilation error
-}
-
-fn print_a<T: Display + 'static>(t: &T) {
-  println!("{}", t);
-}
-
-fn print_b<T>(t: &T)
-where
-  T: Display + 'static,
-{
-  println!("{}", t);
-}
-
-fn print_c(t: &'static dyn Display) {
-  println!("{}", t)
-}
-
-fn print_d(t: &'static impl Display) {
-  println!("{}", t)
-}
-
-fn print_e(t: &(dyn Display + 'static)) {
-  println!("{}", t)
-}
-
-fn print_f(t: &(impl Display + 'static)) {
-  println!("{}", t)
-}
-
-fn print_g(t: &'static String) {
-  println!("{}", t);
-}
-```