Add expected output to tests

Author: cgm616

tests/ui/xor_used_as_pow.fixed

@@ -0,0 +1,32 @@
+// run-rustfix
+#![warn(clippy::xor_used_as_pow)]
+
+// Should not be linted
+enum E {
+    First = 1 ^ 8,
+    Second = 2 ^ 8,
+    Third = 3 ^ 8,
+    Tenth = 10 ^ 8,
+}
+
+fn main() {
+    // These should succeed:
+    let _ = 9 ^ 3; // lhs other than 2 or 10
+    let _ = 0x02 ^ 6; // lhs not decimal
+    let _ = 2 ^ 0x10; // rhs hexadecimal
+    let _ = 10 ^ 0b0101; // rhs binary
+    let _ = 2 ^ 0o1; // rhs octal
+    let _ = 10 ^ -18; // negative rhs
+
+    // These should fail
+    let _ = 1_u32 << 3;
+    let _ = 10 ^ 4;
+    let _ = 1_u64 << 32;
+    let _ = 1;
+    let _ = 10 ^ 0;
+    {
+        let x = 15;
+        let _ = 2 ^ x;
+        let _ = 10 ^ x;
+    }
+}

tests/ui/xor_used_as_pow.stderr

@@ -1,24 +1,52 @@
-error: it appears you are trying to get the maximum value of an integer, but `^` is not an exponentiation operator
-  --> $DIR/xor_used_as_pow.rs:12:20
+error: it appears you are trying to get a power of two, but `^` is not an exponentiation operator
+  --> $DIR/xor_used_as_pow.rs:22:13
    |
-LL |     println!("{}", 2 ^ 16);
-   |                    ^^^^^^ help: try: `std::u16::MAX`
+LL |     let _ = 2 ^ 3;
+   |             ^^^^^ help: use a bitshift instead: `1_u32 << 3`
    |
    = note: `-D clippy::xor-used-as-pow` implied by `-D warnings`
 
+error: `^` is not an exponentiation operator but appears to have been used as one
+  --> $DIR/xor_used_as_pow.rs:23:13
+   |
+LL |     let _ = 10 ^ 4;
+   |             ^^^^^^
+   |
+   = help: did you mean to use .pow()?
+
+error: it appears you are trying to get a power of two, but `^` is not an exponentiation operator
+  --> $DIR/xor_used_as_pow.rs:24:13
+   |
+LL |     let _ = 2 ^ 32;
+   |             ^^^^^^ help: use a bitshift instead: `1_u64 << 32`
+
+error: the operation is ineffective. Consider reducing it to `2`
+  --> $DIR/xor_used_as_pow.rs:25:13
+   |
+LL |     let _ = 2 ^ 0;
+   |             ^^^^^
+   |
+   = note: `-D clippy::identity-op` implied by `-D warnings`
+
 error: it appears you are trying to get a power of two, but `^` is not an exponentiation operator
-  --> $DIR/xor_used_as_pow.rs:13:20
+  --> $DIR/xor_used_as_pow.rs:25:13
+   |
+LL |     let _ = 2 ^ 0;
+   |             ^^^^^ help: try: `1`
+
+error: the operation is ineffective. Consider reducing it to `10`
+  --> $DIR/xor_used_as_pow.rs:26:13
    |
-LL |     println!("{}", 2 ^ 7);
-   |                    ^^^^^ help: use a bitshift instead: `1 << 7`
+LL |     let _ = 10 ^ 0;
+   |             ^^^^^^
 
 error: `^` is not an exponentiation operator but appears to have been used as one
-  --> $DIR/xor_used_as_pow.rs:14:20
+  --> $DIR/xor_used_as_pow.rs:26:13
    |
-LL |     println!("{}", 9 ^ 3);
-   |                    ^^^^^
+LL |     let _ = 10 ^ 0;
+   |             ^^^^^^
    |
    = help: did you mean to use .pow()?
 
-error: aborting due to 3 previous errors
+error: aborting due to 7 previous errors