Add test

src/test/ui/suggestions/call-on-missing.rs

@@ -0,0 +1,19 @@
+struct Foo { i: i32 }
+
+impl Foo {
+    fn bar(&self) {}
+}
+
+fn foo() -> Foo {
+    Foo { i: 1 }
+}
+
+fn main() {
+    foo.bar();
+    //~^ ERROR no method named `bar`
+    //~| HELP use parentheses to call this function
+
+    foo.i;
+    //~^ ERROR no field `i`
+    //~| HELP use parentheses to call this function
+}

src/test/ui/suggestions/call-on-missing.stderr

@@ -0,0 +1,26 @@
+error[E0599]: no method named `bar` found for fn item `fn() -> Foo {foo}` in the current scope
+  --> $DIR/call-on-missing.rs:12:9
+   |
+LL |     foo.bar();
+   |         ^^^ method not found in `fn() -> Foo {foo}`
+   |
+help: use parentheses to call this function
+   |
+LL |     foo().bar();
+   |        ++
+
+error[E0609]: no field `i` on type `fn() -> Foo {foo}`
+  --> $DIR/call-on-missing.rs:16:9
+   |
+LL |     foo.i;
+   |         ^
+   |
+help: use parentheses to call this function
+   |
+LL |     foo().i;
+   |        ++
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0599, E0609.
+For more information about an error, try `rustc --explain E0599`.