feat(rustc_typeck): suggest removing bad parens in (recv.method)()

Fixes #88803

Author: notriddle

compiler/rustc_typeck/src/check/expr.rs

@@ -1842,7 +1842,23 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             expr_t
         );
         err.span_label(field.span, "method, not a field");
-        if !self.expr_in_place(expr.hir_id) {
+        let expr_is_call = if let hir::Node::Expr(parent_expr) =
+            self.tcx.hir().get(self.tcx.hir().get_parent_node(expr.hir_id))
+        {
+            matches!(parent_expr.kind, ExprKind::Call(..))
+        } else {
+            false
+        };
+        let expr_snippet =
+            self.tcx.sess.source_map().span_to_snippet(expr.span).unwrap_or(String::new());
+        if expr_is_call && expr_snippet.starts_with("(") && expr_snippet.ends_with(")") {
+            err.span_suggestion_short(
+                expr.span,
+                "remove wrapping parentheses to call the method",
+                expr_snippet[1..expr_snippet.len() - 1].to_owned(),
+                Applicability::MachineApplicable,
+            );
+        } else if !self.expr_in_place(expr.hir_id) {
             self.suggest_method_call(
                 &mut err,
                 "use parentheses to call the method",

src/test/ui/typeck/issue-88803-call-expr-method.rs

@@ -0,0 +1,7 @@
+fn main() {
+    let a = Some(42);
+    println!(
+        "The value is {}.",
+        (a.unwrap)() //~ERROR [E0615]
+    );
+}

src/test/ui/typeck/issue-88803-call-expr-method.stderr

@@ -0,0 +1,12 @@
+error[E0615]: attempted to take value of method `unwrap` on type `Option<{integer}>`
+  --> $DIR/issue-88803-call-expr-method.rs:5:12
+   |
+LL |         (a.unwrap)()
+   |         ---^^^^^^-
+   |         |  |
+   |         |  method, not a field
+   |         help: remove wrapping parentheses to call the method
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0615`.