Rollup merge of #86493 - Smittyvb:ctor-typeck-error, r=davidtwco

Say "this enum variant takes"/"this struct takes" instead of "this function takes"

This makes error messages for functions with incorrect argument counts adapt if they refer to a struct or enum variant:
```
error[E0061]: this enum variant takes 1 argument but 0 arguments were supplied
  --> $DIR/struct-enum-wrong-args.rs:7:13
   |
LL |     let _ = Ok();
   |             ^^-- supplied 0 arguments
   |             |
   |             expected 1 argument

error[E0061]: this struct takes 1 argument but 0 arguments were supplied
  --> $DIR/struct-enum-wrong-args.rs:8:13
   |
LL |     let _ = Wrapper();
   |             ^^^^^^^-- supplied 0 arguments
   |             |
   |             expected 1 argument
```

Fixes #86481.

src/test/ui/span/missing-unit-argument.rs

@@ -8,7 +8,7 @@ impl S {
 }
 
 fn main() {
-    let _: Result<(), String> = Ok(); //~ ERROR this function takes
+    let _: Result<(), String> = Ok(); //~ ERROR this enum variant takes
     foo(); //~ ERROR this function takes
     foo(()); //~ ERROR this function takes
     bar(); //~ ERROR this function takes

src/test/ui/span/missing-unit-argument.stderr

@@ -1,4 +1,4 @@
-error[E0061]: this function takes 1 argument but 0 arguments were supplied
+error[E0061]: this enum variant takes 1 argument but 0 arguments were supplied
   --> $DIR/missing-unit-argument.rs:11:33
    |
 LL |     let _: Result<(), String> = Ok();

src/test/ui/typeck/struct-enum-wrong-args.rs

@@ -0,0 +1,14 @@
+// Regression test of #86481.
+struct Wrapper(i32);
+struct DoubleWrapper(i32, i32);
+
+fn main() {
+    let _ = Some(3, 2); //~ ERROR this enum variant takes
+    let _ = Ok(3, 6, 2); //~ ERROR this enum variant takes
+    let _ = Ok(); //~ ERROR this enum variant takes
+    let _ = Wrapper(); //~ ERROR this struct takes
+    let _ = Wrapper(5, 2); //~ ERROR this struct takes
+    let _ = DoubleWrapper(); //~ ERROR this struct takes
+    let _ = DoubleWrapper(5); //~ ERROR this struct takes
+    let _ = DoubleWrapper(5, 2, 7); //~ ERROR this struct takes
+}

src/test/ui/typeck/struct-enum-wrong-args.stderr

@@ -0,0 +1,67 @@
+error[E0061]: this enum variant takes 1 argument but 2 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:6:13
+   |
+LL |     let _ = Some(3, 2);
+   |             ^^^^ -  - supplied 2 arguments
+   |             |
+   |             expected 1 argument
+
+error[E0061]: this enum variant takes 1 argument but 3 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:7:13
+   |
+LL |     let _ = Ok(3, 6, 2);
+   |             ^^ -  -  - supplied 3 arguments
+   |             |
+   |             expected 1 argument
+
+error[E0061]: this enum variant takes 1 argument but 0 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:8:13
+   |
+LL |     let _ = Ok();
+   |             ^^-- supplied 0 arguments
+   |             |
+   |             expected 1 argument
+
+error[E0061]: this struct takes 1 argument but 0 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:9:13
+   |
+LL |     let _ = Wrapper();
+   |             ^^^^^^^-- supplied 0 arguments
+   |             |
+   |             expected 1 argument
+
+error[E0061]: this struct takes 1 argument but 2 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:10:13
+   |
+LL |     let _ = Wrapper(5, 2);
+   |             ^^^^^^^ -  - supplied 2 arguments
+   |             |
+   |             expected 1 argument
+
+error[E0061]: this struct takes 2 arguments but 0 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:11:13
+   |
+LL |     let _ = DoubleWrapper();
+   |             ^^^^^^^^^^^^^-- supplied 0 arguments
+   |             |
+   |             expected 2 arguments
+
+error[E0061]: this struct takes 2 arguments but 1 argument was supplied
+  --> $DIR/struct-enum-wrong-args.rs:12:13
+   |
+LL |     let _ = DoubleWrapper(5);
+   |             ^^^^^^^^^^^^^ - supplied 1 argument
+   |             |
+   |             expected 2 arguments
+
+error[E0061]: this struct takes 2 arguments but 3 arguments were supplied
+  --> $DIR/struct-enum-wrong-args.rs:13:13
+   |
+LL |     let _ = DoubleWrapper(5, 2, 7);
+   |             ^^^^^^^^^^^^^ -  -  - supplied 3 arguments
+   |             |
+   |             expected 2 arguments
+
+error: aborting due to 8 previous errors
+
+For more information about this error, try `rustc --explain E0061`.