Auto merge of rust-lang#8844 - smoelius:fixed-paths, r=Alexendoo

Check `.fixed` paths' existence in `run_ui`

This PR adds a test to check that there exists a `.fixed` file for every `.stderr` file in `tests/ui` that mentions a `MachineApplicable` lint. The test leverages `compiletest-rs`'s `rustfix_coverage` option.

I tried to add `.fixed` files where they appeared to be missing. However, 38 exceptional `.rs` files remain. Several of those include comments indicating that they are exceptions, though not all do. Apologies, as I have not tried to associate the 38 files with GH issues. (I think that would be a lot of work, and I worry about linking the wrong issue.)

changelog: none

tests/compile-test.rs

@@ -1,5 +1,6 @@
 #![feature(test)] // compiletest_rs requires this attribute
 #![feature(once_cell)]
+#![feature(is_sorted)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![warn(rust_2018_idioms, unused_lifetimes)]
 
@@ -166,7 +167,8 @@ fn base_config(test_dir: &str) -> compiletest::Config {
 }
 
 fn run_ui() {
-    let config = base_config("ui");
+    let mut config = base_config("ui");
+    config.rustfix_coverage = true;
     // use tests/clippy.toml
     let _g = VarGuard::set("CARGO_MANIFEST_DIR", fs::canonicalize("tests").unwrap());
     let _threads = VarGuard::set(
@@ -179,6 +181,7 @@ fn run_ui() {
         }),
     );
     compiletest::run_tests(&config);
+    check_rustfix_coverage();
 }
 
 fn run_internal_tests() {
@@ -341,6 +344,87 @@ fn compile_test() {
     run_internal_tests();
 }
 
+const RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS: &[&str] = &[
+    "assign_ops2.rs",
+    "cast_size_32bit.rs",
+    "char_lit_as_u8.rs",
+    "cmp_owned/without_suggestion.rs",
+    "dbg_macro.rs",
+    "deref_addrof_double_trigger.rs",
+    "doc/unbalanced_ticks.rs",
+    "eprint_with_newline.rs",
+    "explicit_counter_loop.rs",
+    "iter_skip_next_unfixable.rs",
+    "let_and_return.rs",
+    "literals.rs",
+    "map_flatten.rs",
+    "map_unwrap_or.rs",
+    "match_bool.rs",
+    "mem_replace_macro.rs",
+    "needless_arbitrary_self_type_unfixable.rs",
+    "needless_borrow_pat.rs",
+    "needless_for_each_unfixable.rs",
+    "nonminimal_bool.rs",
+    "print_literal.rs",
+    "print_with_newline.rs",
+    "redundant_static_lifetimes_multiple.rs",
+    "ref_binding_to_reference.rs",
+    "repl_uninit.rs",
+    "result_map_unit_fn_unfixable.rs",
+    "search_is_some.rs",
+    "single_component_path_imports_nested_first.rs",
+    "string_add.rs",
+    "toplevel_ref_arg_non_rustfix.rs",
+    "unit_arg.rs",
+    "unnecessary_clone.rs",
+    "unnecessary_lazy_eval_unfixable.rs",
+    "write_literal.rs",
+    "write_literal_2.rs",
+    "write_with_newline.rs",
+];
+
+fn check_rustfix_coverage() {
+    let missing_coverage_path = Path::new("target/debug/test/ui/rustfix_missing_coverage.txt");
+
+    if let Ok(missing_coverage_contents) = std::fs::read_to_string(missing_coverage_path) {
+        assert!(RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS.iter().is_sorted_by_key(Path::new));
+
+        for rs_path in missing_coverage_contents.lines() {
+            if Path::new(rs_path).starts_with("tests/ui/crashes") {
+                continue;
+            }
+            let filename = Path::new(rs_path).strip_prefix("tests/ui/").unwrap();
+            assert!(
+                RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS
+                    .binary_search_by_key(&filename, Path::new)
+                    .is_ok(),
+                "`{}` runs `MachineApplicable` diagnostics but is missing a `run-rustfix` annotation. \
+                Please either add `// run-rustfix` at the top of the file or add the file to \
+                `RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS` in `tests/compile-test.rs`.",
+                rs_path,
+            );
+        }
+    }
+}
+
+#[test]
+fn rustfix_coverage_known_exceptions_accuracy() {
+    for filename in RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS {
+        let rs_path = Path::new("tests/ui").join(filename);
+        assert!(
+            rs_path.exists(),
+            "`{}` does not exists",
+            rs_path.strip_prefix(env!("CARGO_MANIFEST_DIR")).unwrap().display()
+        );
+        let fixed_path = rs_path.with_extension("fixed");
+        assert!(
+            !fixed_path.exists(),
+            "`{}` exists",
+            fixed_path.strip_prefix(env!("CARGO_MANIFEST_DIR")).unwrap().display()
+        );
+    }
+}
+
 /// Restores an env var on drop
 #[must_use]
 struct VarGuard {

tests/ui/bind_instead_of_map_multipart.fixed

@@ -0,0 +1,62 @@
+// run-rustfix
+#![deny(clippy::bind_instead_of_map)]
+#![allow(clippy::blocks_in_if_conditions)]
+
+pub fn main() {
+    let _ = Some("42").map(|s| if s.len() < 42 { 0 } else { s.len() });
+    let _ = Some("42").and_then(|s| if s.len() < 42 { None } else { Some(s.len()) });
+
+    let _ = Ok::<_, ()>("42").map(|s| if s.len() < 42 { 0 } else { s.len() });
+    let _ = Ok::<_, ()>("42").and_then(|s| if s.len() < 42 { Err(()) } else { Ok(s.len()) });
+
+    let _ = Err::<(), _>("42").map_err(|s| if s.len() < 42 { s.len() + 20 } else { s.len() });
+    let _ = Err::<(), _>("42").or_else(|s| if s.len() < 42 { Ok(()) } else { Err(s.len()) });
+
+    hard_example();
+    macro_example();
+}
+
+fn hard_example() {
+    Some("42").map(|s| {
+        if {
+            if s == "43" {
+                return 43;
+            }
+            s == "42"
+        } {
+            return 45;
+        }
+        match s.len() {
+            10 => 2,
+            20 => {
+                if foo() {
+                    return {
+                        if foo() {
+                            return 20;
+                        }
+                        println!("foo");
+                        3
+                    };
+                }
+                20
+            },
+            40 => 30,
+            _ => 1,
+        }
+    });
+}
+
+fn foo() -> bool {
+    true
+}
+
+macro_rules! m {
+    () => {
+        Some(10)
+    };
+}
+
+fn macro_example() {
+    let _ = Some("").and_then(|s| if s.len() == 20 { m!() } else { Some(20) });
+    let _ = Some("").map(|s| if s.len() == 20 { m!() } else { Some(20) });
+}

tests/ui/bind_instead_of_map_multipart.rs

@@ -1,3 +1,4 @@
+// run-rustfix
 #![deny(clippy::bind_instead_of_map)]
 #![allow(clippy::blocks_in_if_conditions)]
 

tests/ui/bind_instead_of_map_multipart.stderr

@@ -1,11 +1,11 @@
 error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`
-  --> $DIR/bind_instead_of_map_multipart.rs:5:13
+  --> $DIR/bind_instead_of_map_multipart.rs:6:13
    |
 LL |     let _ = Some("42").and_then(|s| if s.len() < 42 { Some(0) } else { Some(s.len()) });
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: the lint level is defined here
-  --> $DIR/bind_instead_of_map_multipart.rs:1:9
+  --> $DIR/bind_instead_of_map_multipart.rs:2:9
    |
 LL | #![deny(clippy::bind_instead_of_map)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -15,7 +15,7 @@ LL |     let _ = Some("42").map(|s| if s.len() < 42 { 0 } else { s.len() });
    |                        ~~~                       ~          ~~~~~~~
 
 error: using `Result.and_then(|x| Ok(y))`, which is more succinctly expressed as `map(|x| y)`
-  --> $DIR/bind_instead_of_map_multipart.rs:8:13
+  --> $DIR/bind_instead_of_map_multipart.rs:9:13
    |
 LL |     let _ = Ok::<_, ()>("42").and_then(|s| if s.len() < 42 { Ok(0) } else { Ok(s.len()) });
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -26,7 +26,7 @@ LL |     let _ = Ok::<_, ()>("42").map(|s| if s.len() < 42 { 0 } else { s.len()
    |                               ~~~                       ~          ~~~~~~~
 
 error: using `Result.or_else(|x| Err(y))`, which is more succinctly expressed as `map_err(|x| y)`
-  --> $DIR/bind_instead_of_map_multipart.rs:11:13
+  --> $DIR/bind_instead_of_map_multipart.rs:12:13
    |
 LL |     let _ = Err::<(), _>("42").or_else(|s| if s.len() < 42 { Err(s.len() + 20) } else { Err(s.len()) });
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -37,7 +37,7 @@ LL |     let _ = Err::<(), _>("42").map_err(|s| if s.len() < 42 { s.len() + 20 }
    |                                ~~~~~~~                       ~~~~~~~~~~~~          ~~~~~~~
 
 error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`
-  --> $DIR/bind_instead_of_map_multipart.rs:19:5
+  --> $DIR/bind_instead_of_map_multipart.rs:20:5
    |
 LL | /     Some("42").and_then(|s| {
 LL | |         if {
@@ -59,7 +59,7 @@ LL |             s == "42"
  ...
 
 error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`
-  --> $DIR/bind_instead_of_map_multipart.rs:60:13
+  --> $DIR/bind_instead_of_map_multipart.rs:61:13
    |
 LL |     let _ = Some("").and_then(|s| if s.len() == 20 { Some(m!()) } else { Some(Some(20)) });
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/implicit_clone.fixed

@@ -0,0 +1,118 @@
+// run-rustfix
+#![warn(clippy::implicit_clone)]
+#![allow(clippy::clone_on_copy, clippy::redundant_clone)]
+use std::borrow::Borrow;
+use std::ffi::{OsStr, OsString};
+use std::path::PathBuf;
+
+fn return_owned_from_slice(slice: &[u32]) -> Vec<u32> {
+    slice.to_owned()
+}
+
+pub fn own_same<T>(v: T) -> T
+where
+    T: ToOwned<Owned = T>,
+{
+    v.to_owned()
+}
+
+pub fn own_same_from_ref<T>(v: &T) -> T
+where
+    T: ToOwned<Owned = T>,
+{
+    v.to_owned()
+}
+
+pub fn own_different<T, U>(v: T) -> U
+where
+    T: ToOwned<Owned = U>,
+{
+    v.to_owned()
+}
+
+#[derive(Copy, Clone)]
+struct Kitten;
+impl Kitten {
+    // badly named method
+    fn to_vec(self) -> Kitten {
+        Kitten {}
+    }
+}
+impl Borrow<BorrowedKitten> for Kitten {
+    fn borrow(&self) -> &BorrowedKitten {
+        static VALUE: BorrowedKitten = BorrowedKitten {};
+        &VALUE
+    }
+}
+
+struct BorrowedKitten;
+impl ToOwned for BorrowedKitten {
+    type Owned = Kitten;
+    fn to_owned(&self) -> Kitten {
+        Kitten {}
+    }
+}
+
+mod weird {
+    #[allow(clippy::ptr_arg)]
+    pub fn to_vec(v: &Vec<u32>) -> Vec<u32> {
+        v.clone()
+    }
+}
+
+fn main() {
+    let vec = vec![5];
+    let _ = return_owned_from_slice(&vec);
+    let _ = vec.clone();
+    let _ = vec.clone();
+
+    let vec_ref = &vec;
+    let _ = return_owned_from_slice(vec_ref);
+    let _ = vec_ref.clone();
+    let _ = vec_ref.clone();
+
+    // we expect no lint for this
+    let _ = weird::to_vec(&vec);
+
+    // we expect no lints for this
+    let slice: &[u32] = &[1, 2, 3, 4, 5];
+    let _ = return_owned_from_slice(slice);
+    let _ = slice.to_owned();
+    let _ = slice.to_vec();
+
+    let str = "hello world".to_string();
+    let _ = str.clone();
+
+    // testing w/ an arbitrary type
+    let kitten = Kitten {};
+    let _ = kitten.clone();
+    let _ = own_same_from_ref(&kitten);
+    // this shouln't lint
+    let _ = kitten.to_vec();
+
+    // we expect no lints for this
+    let borrowed = BorrowedKitten {};
+    let _ = borrowed.to_owned();
+
+    let pathbuf = PathBuf::new();
+    let _ = pathbuf.clone();
+    let _ = pathbuf.clone();
+
+    let os_string = OsString::from("foo");
+    let _ = os_string.clone();
+    let _ = os_string.clone();
+
+    // we expect no lints for this
+    let os_str = OsStr::new("foo");
+    let _ = os_str.to_owned();
+    let _ = os_str.to_os_string();
+
+    // issue #8227
+    let pathbuf_ref = &pathbuf;
+    let pathbuf_ref = &pathbuf_ref;
+    let _ = pathbuf_ref.to_owned(); // Don't lint. Returns `&PathBuf`
+    let _ = (*pathbuf_ref).clone();
+    let pathbuf_ref = &pathbuf_ref;
+    let _ = pathbuf_ref.to_owned(); // Don't lint. Returns `&&PathBuf`
+    let _ = (**pathbuf_ref).clone();
+}

tests/ui/implicit_clone.rs

@@ -1,5 +1,6 @@
+// run-rustfix
 #![warn(clippy::implicit_clone)]
-#![allow(clippy::redundant_clone)]
+#![allow(clippy::clone_on_copy, clippy::redundant_clone)]
 use std::borrow::Borrow;
 use std::ffi::{OsStr, OsString};
 use std::path::PathBuf;