Rollup merge of #103531 - chenyukang:yukang/fix-103474, r=estebank

Suggest calling the instance method of the same name when method not found

Fixes #103474

src/test/ui/resolve/issue-103474.rs

@@ -0,0 +1,28 @@
+struct S {}
+impl S {
+    fn first(&self) {}
+
+    fn second(&self) {
+        first()
+        //~^ ERROR cannot find function `first` in this scope
+    }
+
+    fn third(&self) {
+        no_method_err()
+        //~^ ERROR cannot find function `no_method_err` in this scope
+    }
+}
+
+// https://github.com/rust-lang/rust/pull/103531#discussion_r1004728080
+struct Foo {
+    i: i32,
+}
+
+impl Foo {
+    fn needs_self() {
+        this.i
+        //~^ ERROR cannot find value `this` in this scope
+    }
+}
+
+fn main() {}

src/test/ui/resolve/issue-103474.stderr

@@ -0,0 +1,35 @@
+error[E0425]: cannot find value `this` in this scope
+  --> $DIR/issue-103474.rs:23:9
+   |
+LL |         this.i
+   |         ^^^^ not found in this scope
+   |
+help: you might have meant to use `self` here instead
+   |
+LL |         self.i
+   |         ~~~~
+help: if you meant to use `self`, you are also missing a `self` receiver argument
+   |
+LL |     fn needs_self(&self) {
+   |                   +++++
+
+error[E0425]: cannot find function `first` in this scope
+  --> $DIR/issue-103474.rs:6:9
+   |
+LL |         first()
+   |         ^^^^^ not found in this scope
+   |
+help: consider using the associated function
+   |
+LL |         self.first()
+   |         +++++
+
+error[E0425]: cannot find function `no_method_err` in this scope
+  --> $DIR/issue-103474.rs:11:9
+   |
+LL |         no_method_err()
+   |         ^^^^^^^^^^^^^ not found in this scope
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0425`.

src/test/ui/resolve/issue-2356.stderr

@@ -85,7 +85,7 @@ LL |         static_method();
 help: consider using the associated function
    |
 LL |         Self::static_method();
-   |         ~~~~~~~~~~~~~~~~~~~
+   |         ++++++
 
 error[E0425]: cannot find function `purr` in this scope
   --> $DIR/issue-2356.rs:54:9
@@ -114,7 +114,7 @@ LL |     grow_older();
 help: consider using the associated function
    |
 LL |     Self::grow_older();
-   |     ~~~~~~~~~~~~~~~~
+   |     ++++++
 
 error[E0425]: cannot find function `shave` in this scope
   --> $DIR/issue-2356.rs:74:5

src/test/ui/self/class-missing-self.stderr

@@ -10,6 +10,10 @@ error[E0425]: cannot find function `sleep` in this scope
 LL |       sleep();
    |       ^^^^^ not found in this scope
    |
+help: consider using the associated function
+   |
+LL |       self.sleep();
+   |       +++++
 help: consider importing this function
    |
 LL | use std::thread::sleep;

src/test/ui/suggestions/assoc_fn_without_self.stderr

@@ -7,13 +7,18 @@ LL |         foo();
 help: consider using the associated function
    |
 LL |         Self::foo();
-   |         ~~~~~~~~~
+   |         ++++++
 
 error[E0425]: cannot find function `bar` in this scope
   --> $DIR/assoc_fn_without_self.rs:17:9
    |
 LL |         bar();
    |         ^^^ not found in this scope
+   |
+help: consider using the associated function
+   |
+LL |         self.bar();
+   |         +++++
 
 error[E0425]: cannot find function `baz` in this scope
   --> $DIR/assoc_fn_without_self.rs:18:9
@@ -24,7 +29,7 @@ LL |         baz(2, 3);
 help: consider using the associated function
    |
 LL |         Self::baz(2, 3);
-   |         ~~~~~~~~~
+   |         ++++++
 
 error[E0425]: cannot find function `foo` in this scope
   --> $DIR/assoc_fn_without_self.rs:14:13