Auto merge of #4408 - phansch:more_rustfix_tests, r=flip1995

More rustfix tests

<!--
Thank you for making Clippy better!

We're collecting our changelog from pull request descriptions.
If your PR only updates to the latest nightly, you can leave the
`changelog` entry as `none`. Otherwise, please write a short comment
explaining your change.

If your PR fixes an issue, you can add "fixes #issue_number" into this
PR description. This way the issue will be automatically closed when
your PR is merged.

If you added a new lint, here's a checklist for things that will be
checked during review or continuous integration.

- [ ] Followed [lint naming conventions][lint_naming]
- [ ] Added passing UI tests (including committed `.stderr` file)
- [ ] `cargo test` passes locally
- [ ] Executed `./util/dev update_lints`
- [ ] Added lint documentation
- [ ] Run `./util/dev fmt`

[lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints

Note that you can skip the above if you are just opening a WIP PR in
order to get feedback.

Delete this line and everything above before opening your PR -->

cc #3630

This is probably easier reviewed per-commit.

changelog: none

Author: bors

clippy_lints/src/attrs.rs

@@ -277,7 +277,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Attributes {
                                                         line_span,
                                                         "if you just forgot a `!`, use",
                                                         sugg,
-                                                        Applicability::MachineApplicable,
+                                                        Applicability::MaybeIncorrect,
                                                     );
                                                 },
                                             );

clippy_lints/src/int_plus_one.rs

@@ -158,7 +158,7 @@ impl IntPlusOne {
             |db| {
                 db.span_suggestion(
                     block.span,
-                    "change `>= y + 1` to `> y` as shown",
+                    "change it to",
                     recommendation,
                     Applicability::MachineApplicable, // snippet
                 );

clippy_lints/src/misc.rs

@@ -407,7 +407,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MiscLints {
                                 lhs - rhs,
                                 if op == BinOpKind::Eq { '<' } else { '>' }
                             ),
-                            Applicability::MachineApplicable, // snippet
+                            Applicability::HasPlaceholders, // snippet
                         );
                         db.span_note(expr.span, "std::f32::EPSILON and std::f64::EPSILON are available.");
                     });

tests/ui/assign_ops.fixed

@@ -0,0 +1,21 @@
+// run-rustfix
+
+#[allow(dead_code, unused_assignments)]
+#[warn(clippy::assign_op_pattern)]
+fn main() {
+    let mut a = 5;
+    a += 1;
+    a += 1;
+    a -= 1;
+    a *= 99;
+    a *= 42;
+    a /= 2;
+    a %= 5;
+    a &= 1;
+    a = 1 - a;
+    a = 5 / a;
+    a = 42 % a;
+    a = 6 << a;
+    let mut s = String::new();
+    s += "bla";
+}

tests/ui/assign_ops.rs

@@ -1,3 +1,5 @@
+// run-rustfix
+
 #[allow(dead_code, unused_assignments)]
 #[warn(clippy::assign_op_pattern)]
 fn main() {

tests/ui/assign_ops.stderr

@@ -1,55 +1,55 @@
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:5:5
+  --> $DIR/assign_ops.rs:7:5
    |
 LL |     a = a + 1;
    |     ^^^^^^^^^ help: replace it with: `a += 1`
    |
    = note: `-D clippy::assign-op-pattern` implied by `-D warnings`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:6:5
+  --> $DIR/assign_ops.rs:8:5
    |
 LL |     a = 1 + a;
    |     ^^^^^^^^^ help: replace it with: `a += 1`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:7:5
+  --> $DIR/assign_ops.rs:9:5
    |
 LL |     a = a - 1;
    |     ^^^^^^^^^ help: replace it with: `a -= 1`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:8:5
+  --> $DIR/assign_ops.rs:10:5
    |
 LL |     a = a * 99;
    |     ^^^^^^^^^^ help: replace it with: `a *= 99`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:9:5
+  --> $DIR/assign_ops.rs:11:5
    |
 LL |     a = 42 * a;
    |     ^^^^^^^^^^ help: replace it with: `a *= 42`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:10:5
+  --> $DIR/assign_ops.rs:12:5
    |
 LL |     a = a / 2;
    |     ^^^^^^^^^ help: replace it with: `a /= 2`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:11:5
+  --> $DIR/assign_ops.rs:13:5
    |
 LL |     a = a % 5;
    |     ^^^^^^^^^ help: replace it with: `a %= 5`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:12:5
+  --> $DIR/assign_ops.rs:14:5
    |
 LL |     a = a & 1;
    |     ^^^^^^^^^ help: replace it with: `a &= 1`
 
 error: manual implementation of an assign operation
-  --> $DIR/assign_ops.rs:18:5
+  --> $DIR/assign_ops.rs:20:5
    |
 LL |     s = s + "bla";
    |     ^^^^^^^^^^^^^ help: replace it with: `s += "bla"`

tests/ui/int_plus_one.fixed

@@ -0,0 +1,17 @@
+// run-rustfix
+
+#[allow(clippy::no_effect, clippy::unnecessary_operation)]
+#[warn(clippy::int_plus_one)]
+fn main() {
+    let x = 1i32;
+    let y = 0i32;
+
+    let _ = x > y;
+    let _ = y < x;
+
+    let _ = x > y;
+    let _ = y < x;
+
+    let _ = x > y; // should be ok
+    let _ = y < x; // should be ok
+}

tests/ui/int_plus_one.rs

@@ -1,15 +1,17 @@
+// run-rustfix
+
 #[allow(clippy::no_effect, clippy::unnecessary_operation)]
 #[warn(clippy::int_plus_one)]
 fn main() {
     let x = 1i32;
     let y = 0i32;
 
-    x >= y + 1;
-    y + 1 <= x;
+    let _ = x >= y + 1;
+    let _ = y + 1 <= x;
 
-    x - 1 >= y;
-    y <= x - 1;
+    let _ = x - 1 >= y;
+    let _ = y <= x - 1;
 
-    x > y; // should be ok
-    y < x; // should be ok
+    let _ = x > y; // should be ok
+    let _ = y < x; // should be ok
 }

tests/ui/int_plus_one.stderr

@@ -1,44 +1,28 @@
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:7:5
+  --> $DIR/int_plus_one.rs:9:13
    |
-LL |     x >= y + 1;
-   |     ^^^^^^^^^^
+LL |     let _ = x >= y + 1;
+   |             ^^^^^^^^^^ help: change it to: `x > y`
    |
    = note: `-D clippy::int-plus-one` implied by `-D warnings`
-help: change `>= y + 1` to `> y` as shown
-   |
-LL |     x > y;
-   |     ^^^^^
 
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:8:5
-   |
-LL |     y + 1 <= x;
-   |     ^^^^^^^^^^
-help: change `>= y + 1` to `> y` as shown
+  --> $DIR/int_plus_one.rs:10:13
    |
-LL |     y < x;
-   |     ^^^^^
+LL |     let _ = y + 1 <= x;
+   |             ^^^^^^^^^^ help: change it to: `y < x`
 
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:10:5
+  --> $DIR/int_plus_one.rs:12:13
    |
-LL |     x - 1 >= y;
-   |     ^^^^^^^^^^
-help: change `>= y + 1` to `> y` as shown
-   |
-LL |     x > y;
-   |     ^^^^^
+LL |     let _ = x - 1 >= y;
+   |             ^^^^^^^^^^ help: change it to: `x > y`
 
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:11:5
-   |
-LL |     y <= x - 1;
-   |     ^^^^^^^^^^
-help: change `>= y + 1` to `> y` as shown
+  --> $DIR/int_plus_one.rs:13:13
    |
-LL |     y < x;
-   |     ^^^^^
+LL |     let _ = y <= x - 1;
+   |             ^^^^^^^^^^ help: change it to: `y < x`
 
 error: aborting due to 4 previous errors
 

tests/ui/outer_expn_data.fixed

@@ -0,0 +1,25 @@
+// run-rustfix
+
+#![deny(clippy::internal)]
+#![feature(rustc_private)]
+
+#[macro_use]
+extern crate rustc;
+use rustc::hir::Expr;
+use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+
+declare_lint! {
+    pub TEST_LINT,
+    Warn,
+    ""
+}
+
+declare_lint_pass!(Pass => [TEST_LINT]);
+
+impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
+    fn check_expr(&mut self, _cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
+        let _ = expr.span.ctxt().outer_expn_data();
+    }
+}
+
+fn main() {}