Add regression test for issue-71732

Author: JohnTitor

src/test/ui/inference/issue-71732.rs

@@ -0,0 +1,23 @@
+// Regression test for #71732, it used to emit incorrect diagnostics, like:
+// error[E0283]: type annotations needed
+//  --> src/main.rs:5:10
+//   |
+// 5 |         .get(&"key".into())
+//   |          ^^^ cannot infer type for struct `String`
+//   |
+//   = note: cannot satisfy `String: Borrow<_>`
+// help: consider specifying the type argument in the method call
+//   |
+// 5 |         .get::<Q>(&"key".into())
+//   |
+
+use std::collections::hash_map::HashMap;
+
+fn foo(parameters: &HashMap<String, String>) -> bool {
+    parameters
+        .get(&"key".into()) //~ ERROR: type annotations needed
+        .and_then(|found: &String| Some(false))
+        .unwrap_or(false)
+}
+
+fn main() {}

src/test/ui/inference/issue-71732.stderr

@@ -0,0 +1,13 @@
+error[E0283]: type annotations needed
+  --> $DIR/issue-71732.rs:18:10
+   |
+LL |         .get(&"key".into())
+   |          ^^^  ------------ this method call resolves to `T`
+   |          |
+   |          cannot infer type for type parameter `Q` declared on the associated function `get`
+   |
+   = note: cannot satisfy `String: Borrow<_>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0283`.