Set mir_opt_level=0

This introduces some FNs. But a building Clippy is more important for now

src/driver.rs

@@ -75,6 +75,8 @@ impl rustc_driver::Callbacks for ClippyCallbacks {
             clippy_lints::register_pre_expansion_lints(&mut lint_store, &conf);
             clippy_lints::register_renamed(&mut lint_store);
         }));
+
+        config.opts.debugging_opts.mir_opt_level = 0;
     }
 }
 

tests/ui/indexing_slicing.stderr

@@ -1,23 +1,3 @@
-error: index out of bounds: the len is 4 but the index is 4
-  --> $DIR/indexing_slicing.rs:18:5
-   |
-LL |     x[4]; // Ok, let rustc's `const_err` lint handle `usize` indexing on arrays.
-   |     ^^^^
-   |
-   = note: `#[deny(const_err)]` on by default
-
-error: index out of bounds: the len is 4 but the index is 8
-  --> $DIR/indexing_slicing.rs:19:5
-   |
-LL |     x[1 << 3]; // Ok, let rustc's `const_err` lint handle `usize` indexing on arrays.
-   |     ^^^^^^^^^
-
-error: index out of bounds: the len is 4 but the index is 15
-  --> $DIR/indexing_slicing.rs:54:5
-   |
-LL |     x[N]; // Ok, let rustc's `const_err` lint handle `usize` indexing on arrays.
-   |     ^^^^
-
 error: indexing may panic.
   --> $DIR/indexing_slicing.rs:13:5
    |
@@ -209,5 +189,5 @@ LL |     v[M];
    |
    = help: Consider using `.get(n)` or `.get_mut(n)` instead
 
-error: aborting due to 27 previous errors
+error: aborting due to 24 previous errors
 

tests/ui/missing_const_for_fn/cant_be_const.rs

@@ -32,8 +32,11 @@ fn random_caller() -> u32 {
 
 static Y: u32 = 0;
 
+// We should not suggest to make this function `const` because const functions are not allowed to
+// refer to a static variable
 fn get_y() -> u32 {
     Y
+    //~^ ERROR E0013
 }
 
 // Don't lint entrypoint functions

tests/ui/redundant_clone.fixed

@@ -18,11 +18,11 @@ fn main() {
 
     let _s = Path::new("/a/b/").join("c");
 
-    let _s = Path::new("/a/b/").join("c");
+    let _s = Path::new("/a/b/").join("c").to_path_buf();
 
     let _s = OsString::new();
 
-    let _s = OsString::new();
+    let _s = OsString::new().to_os_string();
 
     // Check that lint level works
     #[allow(clippy::redundant_clone)]
@@ -47,6 +47,7 @@ fn main() {
     let _ = Some(String::new()).unwrap_or_else(|| x.0.clone()); // ok; closure borrows `x`
 
     with_branch(Alpha, true);
+    cannot_double_move(Alpha);
     cannot_move_from_type_with_drop();
     borrower_propagation();
 }
@@ -61,6 +62,10 @@ fn with_branch(a: Alpha, b: bool) -> (Alpha, Alpha) {
     }
 }
 
+fn cannot_double_move(a: Alpha) -> (Alpha, Alpha) {
+    (a.clone(), a)
+}
+
 struct TypeWithDrop {
     x: String,
 }

tests/ui/redundant_clone.rs

@@ -47,6 +47,7 @@ fn main() {
     let _ = Some(String::new()).unwrap_or_else(|| x.0.clone()); // ok; closure borrows `x`
 
     with_branch(Alpha, true);
+    cannot_double_move(Alpha);
     cannot_move_from_type_with_drop();
     borrower_propagation();
 }
@@ -61,6 +62,10 @@ fn with_branch(a: Alpha, b: bool) -> (Alpha, Alpha) {
     }
 }
 
+fn cannot_double_move(a: Alpha) -> (Alpha, Alpha) {
+    (a.clone(), a)
+}
+
 struct TypeWithDrop {
     x: String,
 }

tests/ui/redundant_clone.stderr

@@ -59,18 +59,6 @@ note: this value is dropped without further use
 LL |     let _s = Path::new("/a/b/").join("c").to_owned();
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: redundant clone
-  --> $DIR/redundant_clone.rs:21:42
-   |
-LL |     let _s = Path::new("/a/b/").join("c").to_path_buf();
-   |                                          ^^^^^^^^^^^^^^ help: remove this
-   |
-note: this value is dropped without further use
-  --> $DIR/redundant_clone.rs:21:14
-   |
-LL |     let _s = Path::new("/a/b/").join("c").to_path_buf();
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
 error: redundant clone
   --> $DIR/redundant_clone.rs:23:29
    |
@@ -83,18 +71,6 @@ note: this value is dropped without further use
 LL |     let _s = OsString::new().to_owned();
    |              ^^^^^^^^^^^^^^^
 
-error: redundant clone
-  --> $DIR/redundant_clone.rs:25:29
-   |
-LL |     let _s = OsString::new().to_os_string();
-   |                             ^^^^^^^^^^^^^^^ help: remove this
-   |
-note: this value is dropped without further use
-  --> $DIR/redundant_clone.rs:25:14
-   |
-LL |     let _s = OsString::new().to_os_string();
-   |              ^^^^^^^^^^^^^^^
-
 error: redundant clone
   --> $DIR/redundant_clone.rs:32:19
    |
@@ -108,52 +84,52 @@ LL |     let _t = tup.0.clone();
    |              ^^^^^
 
 error: redundant clone
-  --> $DIR/redundant_clone.rs:58:22
+  --> $DIR/redundant_clone.rs:59:22
    |
 LL |         (a.clone(), a.clone())
    |                      ^^^^^^^^ help: remove this
    |
 note: this value is dropped without further use
-  --> $DIR/redundant_clone.rs:58:21
+  --> $DIR/redundant_clone.rs:59:21
    |
 LL |         (a.clone(), a.clone())
    |                     ^
 
 error: redundant clone
-  --> $DIR/redundant_clone.rs:114:15
+  --> $DIR/redundant_clone.rs:119:15
    |
 LL |     let _s = s.clone();
    |               ^^^^^^^^ help: remove this
    |
 note: this value is dropped without further use
-  --> $DIR/redundant_clone.rs:114:14
+  --> $DIR/redundant_clone.rs:119:14
    |
 LL |     let _s = s.clone();
    |              ^
 
 error: redundant clone
-  --> $DIR/redundant_clone.rs:115:15
+  --> $DIR/redundant_clone.rs:120:15
    |
 LL |     let _t = t.clone();
    |               ^^^^^^^^ help: remove this
    |
 note: this value is dropped without further use
-  --> $DIR/redundant_clone.rs:115:14
+  --> $DIR/redundant_clone.rs:120:14
    |
 LL |     let _t = t.clone();
    |              ^
 
 error: redundant clone
-  --> $DIR/redundant_clone.rs:125:19
+  --> $DIR/redundant_clone.rs:130:19
    |
 LL |         let _f = f.clone();
    |                   ^^^^^^^^ help: remove this
    |
 note: this value is dropped without further use
-  --> $DIR/redundant_clone.rs:125:18
+  --> $DIR/redundant_clone.rs:130:18
    |
 LL |         let _f = f.clone();
    |                  ^
 
-error: aborting due to 13 previous errors
+error: aborting due to 11 previous errors