iterate List by value

[rust.git] / tests / ui / eta.rs

diff --git a/tests/ui/eta.rs b/tests/ui/eta.rs
index 6eeb093eae992cd01d45328743aaed6bde79abab..4f050bd8479ae90e7784ffc33bd44698c17724df 100644 (file)
--- a/tests/ui/eta.rs
+++ b/tests/ui/eta.rs
@@ -1,13 +1,18 @@
+// run-rustfix
+
 #![allow(
     unused,
     clippy::no_effect,
     clippy::redundant_closure_call,
     clippy::many_single_char_names,
     clippy::needless_pass_by_value,
-    clippy::option_map_unit_fn,
-    clippy::trivially_copy_pass_by_ref
+    clippy::option_map_unit_fn
+)]
+#![warn(
+    clippy::redundant_closure,
+    clippy::redundant_closure_for_method_calls,
+    clippy::needless_borrow
 )]
-#![warn(clippy::redundant_closure, clippy::needless_borrow)]
 
 use std::path::PathBuf;
 
@@ -26,8 +31,8 @@ fn main() {
     let e = Some(1u8).map(|a| generic(a));
     let e = Some(1u8).map(generic);
     // See #515
-    let a: Option<Box<::std::ops::Deref<Target = [i32]>>> =
-        Some(vec![1i32, 2]).map(|v| -> Box<::std::ops::Deref<Target = [i32]>> { Box::new(v) });
+    let a: Option<Box<dyn (::std::ops::Deref<Target = [i32]>)>> =
+        Some(vec![1i32, 2]).map(|v| -> Box<dyn (::std::ops::Deref<Target = [i32]>)> { Box::new(v) });
 }
 
 trait TestTrait {
@@ -88,6 +93,38 @@ fn test_redundant_closures_containing_method_calls() {
     let c = Some(TestStruct { some_ref: &i })
         .as_ref()
         .map(|c| c.to_ascii_uppercase());
+
+    fn test_different_borrow_levels<T>(t: &[&T])
+    where
+        T: TestTrait,
+    {
+        t.iter().filter(|x| x.trait_foo_ref());
+        t.iter().map(|x| x.trait_foo_ref());
+    }
+
+    let mut some = Some(|x| x * x);
+    let arr = [Ok(1), Err(2)];
+    let _: Vec<_> = arr.iter().map(|x| x.map_err(|e| some.take().unwrap()(e))).collect();
+}
+
+struct Thunk<T>(Box<dyn FnMut() -> T>);
+
+impl<T> Thunk<T> {
+    fn new<F: 'static + FnOnce() -> T>(f: F) -> Thunk<T> {
+        let mut option = Some(f);
+        // This should not trigger redundant_closure (#1439)
+        Thunk(Box::new(move || option.take().unwrap()()))
+    }
+
+    fn unwrap(self) -> T {
+        let Thunk(mut f) = self;
+        f()
+    }
+}
+
+fn foobar() {
+    let thunk = Thunk::new(|| println!("Hello, world!"));
+    thunk.unwrap()
 }
 
 fn meta<F>(f: F)
@@ -123,3 +160,45 @@ fn divergent(_: u8) -> ! {
 fn generic<T>(_: T) -> u8 {
     0
 }
+
+fn passes_fn_mut(mut x: Box<dyn FnMut()>) {
+    requires_fn_once(|| x());
+}
+fn requires_fn_once<T: FnOnce()>(_: T) {}
+
+fn test_redundant_closure_with_function_pointer() {
+    type FnPtrType = fn(u8);
+    let foo_ptr: FnPtrType = foo;
+    let a = Some(1u8).map(|a| foo_ptr(a));
+}
+
+fn test_redundant_closure_with_another_closure() {
+    let closure = |a| println!("{}", a);
+    let a = Some(1u8).map(|a| closure(a));
+}
+
+fn make_lazy(f: impl Fn() -> fn(u8) -> u8) -> impl Fn(u8) -> u8 {
+    // Currently f is called when result of make_lazy is called.
+    // If the closure is removed, f will be called when make_lazy itself is
+    // called. This changes semantics, so the closure must stay.
+    Box::new(move |x| f()(x))
+}
+
+fn call<F: FnOnce(&mut String) -> String>(f: F) -> String {
+    f(&mut "Hello".to_owned())
+}
+fn test_difference_in_mutability() {
+    call(|s| s.clone());
+}
+
+struct Bar;
+impl std::ops::Deref for Bar {
+    type Target = str;
+    fn deref(&self) -> &str {
+        "hi"
+    }
+}
+
+fn test_deref_with_trait_method() {
+    let _ = [Bar].iter().map(|s| s.to_string()).collect::<Vec<_>>();
+}