update doc

Signed-off-by: TXXT <[email protected]>

src/lib.rs

@@ -28,17 +28,17 @@
 //! I/O panic:
 //!
 //! ```rust
-//! use fail::{fail_point, FailScenario};
+//! use fail::fail_point;
 //!
 //! fn do_fallible_work() {
 //!     fail_point!("read-dir");
 //!     let _dir: Vec<_> = std::fs::read_dir(".").unwrap().collect();
 //!     // ... do some work on the directory ...
 //! }
 //!
-//! let scenario = FailScenario::setup();
+//! fail::setup();
 //! do_fallible_work();
-//! scenario.teardown();
+//! fail::teardown();
 //! println!("done");
 //! ```
 //!
@@ -82,7 +82,7 @@
 //! Here's a basic pattern for writing unit tests tests with fail points:
 //!
 //! ```rust
-//! use fail::{fail_point, FailScenario};
+//! use fail::fail_point;
 //!
 //! fn do_fallible_work() {
 //!     fail_point!("read-dir");
@@ -93,12 +93,12 @@
 //! #[test]
 //! #[should_panic]
 //! fn test_fallible_work() {
-//!     let scenario = FailScenario::setup();
+//!     fail::setup();
 //!     fail::cfg("read-dir", "panic").unwrap();
 //!
 //!     do_fallible_work();
 //!
-//!     scenario.teardown();
+//!     fail::teardown();
 //! }
 //! ```
 //!
@@ -131,7 +131,7 @@
 //! function we used earlier to return a `Result`:
 //!
 //! ```rust
-//! use fail::{fail_point, FailScenario};
+//! use fail::fail_point;
 //! use std::io;
 //!
 //! fn do_fallible_work() -> io::Result<()> {
@@ -142,9 +142,9 @@
 //! }
 //!
 //! fn main() -> io::Result<()> {
-//!     let scenario = FailScenario::setup();
+//!     fail::setup();
 //!     do_fallible_work()?;
-//!     scenario.teardown();
+//!     fail::teardown();
 //!     println!("done");
 //!     Ok(())
 //! }
@@ -653,13 +653,12 @@ pub fn eval<R, F: FnOnce(Option<String>) -> R>(name: &str, f: F) -> Option<R> {
     let id = thread::current().id();
     let group = REGISTRY_GROUP.read().unwrap();
 
-    let registry = group
-        .get(&id)
-        .unwrap_or(&REGISTRY_GLOBAL.registry)
-        .read()
-        .unwrap();
-
     let p = {
+        let registry = group
+            .get(&id)
+            .unwrap_or(&REGISTRY_GLOBAL.registry)
+            .read()
+            .unwrap();
         match registry.get(name) {
             None => return None,
             Some(p) => p.clone(),