cleaned up some tests

tests/ui/autoderef-full-lval.rs

@@ -1,25 +0,0 @@
-struct Clam {
-    x: Box<isize>,
-    y: Box<isize>,
-}
-
-
-
-struct Fish {
-    a: Box<isize>,
-}
-
-fn main() {
-    let a: Clam = Clam{ x: Box::new(1), y: Box::new(2) };
-    let b: Clam = Clam{ x: Box::new(10), y: Box::new(20) };
-    let z: isize = a.x + b.y;
-    //~^ ERROR cannot add `Box<isize>` to `Box<isize>`
-    println!("{}", z);
-    assert_eq!(z, 21);
-    let forty: Fish = Fish{ a: Box::new(40) };
-    let two: Fish = Fish{ a: Box::new(2) };
-    let answer: isize = forty.a + two.a;
-    //~^ ERROR cannot add `Box<isize>` to `Box<isize>`
-    println!("{}", answer);
-    assert_eq!(answer, 42);
-}

tests/ui/autoref-autoderef/autoderef-box-no-add.rs

@@ -0,0 +1,35 @@
+//! Tests that auto-dereferencing does not allow addition of `Box<isize>` values.
+//!
+//! This test ensures that `Box<isize>` fields in structs (`Clam` and `Fish`) are not
+//! automatically dereferenced to `isize` during addition operations, as `Box<isize>`
+//! does not implement the `Add` trait.
+
+struct Clam {
+    x: Box<isize>,
+    y: Box<isize>,
+}
+
+struct Fish {
+    a: Box<isize>,
+}
+
+fn main() {
+    let a: Clam = Clam {
+        x: Box::new(1),
+        y: Box::new(2),
+    };
+    let b: Clam = Clam {
+        x: Box::new(10),
+        y: Box::new(20),
+    };
+    let z: isize = a.x + b.y;
+    //~^ ERROR cannot add `Box<isize>` to `Box<isize>`
+    println!("{}", z);
+    assert_eq!(z, 21);
+    let forty: Fish = Fish { a: Box::new(40) };
+    let two: Fish = Fish { a: Box::new(2) };
+    let answer: isize = forty.a + two.a;
+    //~^ ERROR cannot add `Box<isize>` to `Box<isize>`
+    println!("{}", answer);
+    assert_eq!(answer, 42);
+}

tests/ui/autoref-autoderef/autoderef-box-no-add.stderr

@@ -1,5 +1,5 @@
 error[E0369]: cannot add `Box<isize>` to `Box<isize>`
-  --> $DIR/autoderef-full-lval.rs:15:24
+  --> $DIR/autoderef-box-no-add.rs:25:24
    |
 LL |     let z: isize = a.x + b.y;
    |                    --- ^ --- Box<isize>
@@ -13,7 +13,7 @@ note: the foreign item type `Box<isize>` doesn't implement `Add`
    = note: not implement `Add`
 
 error[E0369]: cannot add `Box<isize>` to `Box<isize>`
-  --> $DIR/autoderef-full-lval.rs:21:33
+  --> $DIR/autoderef-box-no-add.rs:31:33
    |
 LL |     let answer: isize = forty.a + two.a;
    |                         ------- ^ ----- Box<isize>

tests/ui/functions-closures/bare-fn-implements-fn-mut.rs

@@ -1,3 +1,7 @@
+//! Tests that bare functions implement the `FnMut` trait.
+//!
+//! See <https://github.com/rust-lang/rust/issues/15448>.
+
 //@ run-pass
 
 fn call_f<F:FnMut()>(mut f: F) {

tests/ui/lint/overflowing-literals-valid.rs

@@ -1,5 +1,7 @@
+//! Test that valid large numeric literals do not trigger the `overflowing_literals` lint.
+
 //@ run-pass
-// Catch mistakes in the overflowing literals lint.
+
 #![deny(overflowing_literals)]
 
 pub fn main() {

tests/ui/methods/vec-autoderef-autoref.rs

@@ -1,8 +1,7 @@
+//! Test that method resolution does not autoderef `Vec`
+//! into a slice or perform additional autorefs.
+
 fn main() {
-
-    // Testing that method lookup does not automatically borrow
-    // vectors to slices then automatically create a self reference.
-
     let mut a = vec![0];
     a.test_mut(); //~ ERROR no method named `test_mut` found
     a.test(); //~ ERROR no method named `test` found

tests/ui/methods/vec-autoderef-autoref.stderr

@@ -1,12 +1,12 @@
 error[E0599]: no method named `test_mut` found for struct `Vec<{integer}>` in the current scope
-  --> $DIR/auto-ref-slice-plus-ref.rs:7:7
+  --> $DIR/vec-autoderef-autoref.rs:6:7
    |
 LL |     a.test_mut();
    |       ^^^^^^^^
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 note: `MyIter` defines an item `test_mut`, perhaps you need to implement it
-  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+  --> $DIR/vec-autoderef-autoref.rs:13:1
    |
 LL | trait MyIter {
    | ^^^^^^^^^^^^
@@ -14,40 +14,40 @@ help: there is a method `get_mut` with a similar name, but with different argume
   --> $SRC_DIR/core/src/slice/mod.rs:LL:COL
 
 error[E0599]: no method named `test` found for struct `Vec<{integer}>` in the current scope
-  --> $DIR/auto-ref-slice-plus-ref.rs:8:7
+  --> $DIR/vec-autoderef-autoref.rs:7:7
    |
 LL |     a.test();
    |       ^^^^ method not found in `Vec<{integer}>`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 note: `MyIter` defines an item `test`, perhaps you need to implement it
-  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+  --> $DIR/vec-autoderef-autoref.rs:13:1
    |
 LL | trait MyIter {
    | ^^^^^^^^^^^^
 
 error[E0599]: no method named `test` found for array `[{integer}; 1]` in the current scope
-  --> $DIR/auto-ref-slice-plus-ref.rs:10:11
+  --> $DIR/vec-autoderef-autoref.rs:9:11
    |
 LL |     ([1]).test();
    |           ^^^^ method not found in `[{integer}; 1]`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 note: `MyIter` defines an item `test`, perhaps you need to implement it
-  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+  --> $DIR/vec-autoderef-autoref.rs:13:1
    |
 LL | trait MyIter {
    | ^^^^^^^^^^^^
 
 error[E0599]: no method named `test` found for reference `&[{integer}; 1]` in the current scope
-  --> $DIR/auto-ref-slice-plus-ref.rs:11:12
+  --> $DIR/vec-autoderef-autoref.rs:10:12
    |
 LL |     (&[1]).test();
    |            ^^^^ method not found in `&[{integer}; 1]`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
 note: `MyIter` defines an item `test`, perhaps you need to implement it
-  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+  --> $DIR/vec-autoderef-autoref.rs:13:1
    |
 LL | trait MyIter {
    | ^^^^^^^^^^^^

tests/ui/str/str-static-literal.rs

@@ -1,3 +1,5 @@
+//! Check that a bare string literal is typed as a `&'static str` and is usable.
+
 //@ run-pass
 
 pub fn main() {