add skeleton

.gitignore

@@ -0,0 +1 @@
+book

book.toml

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+[book]
+title = "Rust Exercise"
+description = "A set of exercises and examples to pratice various aspects of Rust, also for the rust course (book) at https://course.rs"
+authors = ["course.rs"]
+language = "en"
+multilingual = false
+src = "src"
+
+[output.html.playpen]
+editable = true
+editor = "ace"
+
+[output.html.fold]
+enable = true
+
+[output.html]
+git-repository-url = "https://github.com/course-rs/rust-exercise"
+
+[rust]
+edition = "2021"

src/SUMMARY.md

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+# Summary
+
+- [Lifetime](lifetime/intro.md)
+  - [&'static and T: 'static](lifetime/static.md)

src/lifetime/intro.md

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+# Lifetime

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);
+}
+```