Don't record adjustments twice in note_source_of_type_mismatch_constraint

tests/ui/typeck/dont-record-adjustments-when-pointing-at-arg.rs

@@ -0,0 +1,29 @@
+pub trait NSWindow: Sized {
+    fn frame(self) -> () {
+        unimplemented!()
+    }
+    fn setFrame_display_(self, display: ()) {}
+}
+impl NSWindow for () {}
+
+pub struct NSRect {}
+
+use std::ops::Deref;
+struct MainThreadSafe<T = ()>(T);
+impl<T> Deref for MainThreadSafe<T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        unimplemented!()
+    }
+}
+
+fn main() {
+    || {
+        let ns_window = MainThreadSafe(());
+        // Don't record adjustments twice for `*ns_window`
+        (*ns_window).frame();
+        ns_window.setFrame_display_(0);
+        //~^ ERROR mismatched types
+    };
+}

tests/ui/typeck/dont-record-adjustments-when-pointing-at-arg.stderr

@@ -0,0 +1,17 @@
+error[E0308]: mismatched types
+  --> $DIR/dont-record-adjustments-when-pointing-at-arg.rs:26:37
+   |
+LL |         ns_window.setFrame_display_(0);
+   |                   ----------------- ^ expected `()`, found integer
+   |                   |
+   |                   arguments to this method are incorrect
+   |
+note: method defined here
+  --> $DIR/dont-record-adjustments-when-pointing-at-arg.rs:5:8
+   |
+LL |     fn setFrame_display_(self, display: ()) {}
+   |        ^^^^^^^^^^^^^^^^^       -----------
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.