suggest == to the first expr which has ExprKind::Assign

src/test/ui/type/type-check/assignment-in-if.rs

@@ -53,4 +53,10 @@ fn main() {
         //~| ERROR mismatched types
         println!("{}", x);
     }
+
+    if x = 1 && x == 1 {
+        //~^ ERROR mismatched types
+        //~| ERROR mismatched types
+        println!("{}", x);
+    }
 }

src/test/ui/type/type-check/assignment-in-if.stderr

@@ -104,6 +104,23 @@ help: you might have meant to compare for equality
 LL |     if x == x && x == x && x == x {
    |                               +
 
-error: aborting due to 11 previous errors
+error[E0308]: mismatched types
+  --> $DIR/assignment-in-if.rs:57:12
+   |
+LL |     if x = 1 && x == 1 {
+   |            ^ expected `bool`, found integer
+
+error[E0308]: mismatched types
+  --> $DIR/assignment-in-if.rs:57:8
+   |
+LL |     if x = 1 && x == 1 {
+   |        ^^^^^^^^^^^^^^^ expected `bool`, found `()`
+   |
+help: you might have meant to compare for equality
+   |
+LL |     if x == 1 && x == 1 {
+   |           +
+
+error: aborting due to 13 previous errors
 
 For more information about this error, try `rustc --explain E0308`.