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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/tools/clippy/tests/ui/eta.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/tools/clippy/tests/ui/eta.rs | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/eta.rs b/src/tools/clippy/tests/ui/eta.rs new file mode 100644 index 000000000..f0fb55a1e --- /dev/null +++ b/src/tools/clippy/tests/ui/eta.rs @@ -0,0 +1,305 @@ +// run-rustfix + +#![allow( + unused, + clippy::no_effect, + clippy::redundant_closure_call, + clippy::needless_pass_by_value, + clippy::option_map_unit_fn, + clippy::needless_borrow +)] +#![warn(clippy::redundant_closure, clippy::redundant_closure_for_method_calls)] + +use std::path::{Path, PathBuf}; + +macro_rules! mac { + () => { + foobar() + }; +} + +macro_rules! closure_mac { + () => { + |n| foo(n) + }; +} + +fn main() { + let a = Some(1u8).map(|a| foo(a)); + let c = Some(1u8).map(|a| {1+2; foo}(a)); + true.then(|| mac!()); // don't lint function in macro expansion + Some(1).map(closure_mac!()); // don't lint closure in macro expansion + let _: Option<Vec<u8>> = true.then(|| vec![]); // special case vec! + let d = Some(1u8).map(|a| foo((|b| foo2(b))(a))); //is adjusted? + all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted + unsafe { + Some(1u8).map(|a| unsafe_fn(a)); // unsafe fn + } + + // See #815 + let e = Some(1u8).map(|a| divergent(a)); + let e = Some(1u8).map(|a| generic(a)); + let e = Some(1u8).map(generic); + // See #515 + 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) }); + + // issue #7224 + let _: Option<Vec<u32>> = Some(0).map(|_| vec![]); +} + +trait TestTrait { + fn trait_foo(self) -> bool; + fn trait_foo_ref(&self) -> bool; +} + +struct TestStruct<'a> { + some_ref: &'a i32, +} + +impl<'a> TestStruct<'a> { + fn foo(self) -> bool { + false + } + unsafe fn foo_unsafe(self) -> bool { + true + } +} + +impl<'a> TestTrait for TestStruct<'a> { + fn trait_foo(self) -> bool { + false + } + fn trait_foo_ref(&self) -> bool { + false + } +} + +impl<'a> std::ops::Deref for TestStruct<'a> { + type Target = char; + fn deref(&self) -> &char { + &'a' + } +} + +fn test_redundant_closures_containing_method_calls() { + let i = 10; + let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo()); + let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo()); + let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo_ref()); + let e = Some(&mut vec![1, 2, 3]).map(|v| v.clear()); + unsafe { + let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo_unsafe()); + } + let e = Some("str").map(|s| s.to_string()); + let e = Some('a').map(|s| s.to_uppercase()); + let e: std::vec::Vec<usize> = vec!['a', 'b', 'c'].iter().map(|c| c.len_utf8()).collect(); + let e: std::vec::Vec<char> = vec!['a', 'b', 'c'].iter().map(|c| c.to_ascii_uppercase()).collect(); + let e = Some(PathBuf::new()).as_ref().and_then(|s| s.to_str()); + 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()); + } +} + +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 foo(_: u8) {} + +fn foo2(_: u8) -> u8 { + 1u8 +} + +fn all<X, F>(x: &[X], y: &X, f: F) -> bool +where + F: Fn(&X, &X) -> bool, +{ + x.iter().all(|e| f(e, y)) +} + +fn below(x: &u8, y: &u8) -> bool { + x < y +} + +unsafe fn unsafe_fn(_: u8) {} + +fn divergent(_: u8) -> ! { + unimplemented!() +} + +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<_>>(); +} + +fn mutable_closure_used_again(x: Vec<i32>, y: Vec<i32>, z: Vec<i32>) { + let mut res = Vec::new(); + let mut add_to_res = |n| res.push(n); + x.into_iter().for_each(|x| add_to_res(x)); + y.into_iter().for_each(|x| add_to_res(x)); + z.into_iter().for_each(|x| add_to_res(x)); +} + +fn mutable_closure_in_loop() { + let mut value = 0; + let mut closure = |n| value += n; + for _ in 0..5 { + Some(1).map(|n| closure(n)); + + let mut value = 0; + let mut in_loop = |n| value += n; + Some(1).map(|n| in_loop(n)); + } +} + +fn late_bound_lifetimes() { + fn take_asref_path<P: AsRef<Path>>(path: P) {} + + fn map_str<F>(thunk: F) + where + F: FnOnce(&str), + { + } + + fn map_str_to_path<F>(thunk: F) + where + F: FnOnce(&str) -> &Path, + { + } + map_str(|s| take_asref_path(s)); + map_str_to_path(|s| s.as_ref()); +} + +mod type_param_bound { + trait Trait { + fn fun(); + } + + fn take<T: 'static>(_: T) {} + + fn test<X: Trait>() { + // don't lint, but it's questionable that rust requires a cast + take(|| X::fun()); + take(X::fun as fn()); + } +} + +// #8073 Don't replace closure with `Arc<F>` or `Rc<F>` +fn arc_fp() { + let rc = std::rc::Rc::new(|| 7); + let arc = std::sync::Arc::new(|n| n + 1); + let ref_arc = &std::sync::Arc::new(|_| 5); + + true.then(|| rc()); + (0..5).map(|n| arc(n)); + Some(4).map(|n| ref_arc(n)); +} + +// #8460 Don't replace closures with params bounded as `ref` +mod bind_by_ref { + struct A; + struct B; + + impl From<&A> for B { + fn from(A: &A) -> Self { + B + } + } + + fn test() { + // should not lint + Some(A).map(|a| B::from(&a)); + // should not lint + Some(A).map(|ref a| B::from(a)); + } +} + +// #7812 False positive on coerced closure +fn coerced_closure() { + fn function_returning_unit<F: FnMut(i32)>(f: F) {} + function_returning_unit(|x| std::process::exit(x)); + + fn arr() -> &'static [u8; 0] { + &[] + } + fn slice_fn(_: impl FnOnce() -> &'static [u8]) {} + slice_fn(|| arr()); +} + +// https://github.com/rust-lang/rust-clippy/issues/7861 +fn box_dyn() { + fn f(_: impl Fn(usize) -> Box<dyn std::any::Any>) {} + f(|x| Box::new(x)); +} + +// https://github.com/rust-lang/rust-clippy/issues/5939 +fn not_general_enough() { + fn f(_: impl FnMut(&Path) -> std::io::Result<()>) {} + f(|path| std::fs::remove_file(path)); +} |