Relocate some tests and remove fn-main directory

Relocate issues/issue-51022.rs to
entry-point/main-with-lifetime-param.rs

Relocate issue-50714.rs to entry-point/main-where-fn-bound.rs

Rename issue-118772.rs to main-with-invalid-signature.rs and delete
duplicate test

remove ui/entry-point/issue-118772.rs in issues.txt

Relocate fn-main/wrong-location.rs to entry-point/main-in-submodule.rs

Remove fn-main directory

Relocate issue-50688.rs to mismatched_types/array-len-is-closure.rs

src/tools/tidy/src/issues.txt

@@ -930,7 +930,6 @@ ui/dst/issue-90528-unsizing-suggestion-4.rs
 ui/dyn-keyword/issue-5153.rs
 ui/dyn-keyword/issue-56327-dyn-trait-in-macro-is-okay.rs
 ui/empty/issue-37026.rs
-ui/entry-point/issue-118772.rs
 ui/enum-discriminant/auxiliary/issue-41394.rs
 ui/enum-discriminant/issue-104519.rs
 ui/enum-discriminant/issue-41394-rpass.rs

tests/ui/README.md

@@ -585,10 +585,6 @@ Exercises the `format!` macro.
 
 A broad category of tests on functions.
 
-## `tests/ui/fn-main/`
-
-**FIXME**: Serves a duplicate purpose with `ui/entry-point`, should be combined.
-
 ## `tests/ui/for/`: `for` keyword
 
 Tests on the `for` keyword and some of its associated errors, such as attempting to write the faulty pattern `for _ in 0..1 {} else {}`.

tests/ui/entry-point/main-in-submodule.stderr

@@ -1,11 +1,11 @@
-error[E0601]: `main` function not found in crate `wrong_location`
-  --> $DIR/wrong-location.rs:5:2
+error[E0601]: `main` function not found in crate `main_in_submodule`
+  --> $DIR/main-in-submodule.rs:5:2
    |
 LL | }
-   |  ^ the main function must be defined at the crate level (in `$DIR/wrong-location.rs`)
+   |  ^ the main function must be defined at the crate level (in `$DIR/main-in-submodule.rs`)
    |
 note: here is a function named `main`
-  --> $DIR/wrong-location.rs:4:5
+  --> $DIR/main-in-submodule.rs:4:5
    |
 LL |     fn main() { }
    |     ^^^^^^^^^

tests/ui/entry-point/main-where-fn-bound.stderr

@@ -1,5 +1,5 @@
 error[E0646]: `main` function is not allowed to have a `where` clause
-  --> $DIR/issue-50714.rs:3:11
+  --> $DIR/main-where-fn-bound.rs:3:11
    |
 LL | fn main() where fn(&()): Eq {}
    |           ^^^^^^^^^^^^^^^^^ `main` cannot have a `where` clause

tests/ui/entry-point/main-with-invalid-signature.rs

@@ -1,3 +1,5 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/118772>
+
 fn main(_: &i32) { //~ ERROR `main` function has wrong type
     println!("Hello, world!");
 }

tests/ui/entry-point/main-with-invalid-signature.stderr

@@ -1,5 +1,5 @@
 error[E0580]: `main` function has wrong type
-  --> $DIR/issue-118772.rs:1:1
+  --> $DIR/main-with-invalid-signature.rs:3:1
    |
 LL | fn main(_: &i32) {
    | ^^^^^^^^^^^^^^^^ incorrect number of function parameters

tests/ui/entry-point/main-with-lifetime-param.rs

@@ -0,0 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/51022>
+
+fn main<'a>() {}
+//~^ ERROR `main` function is not allowed to have generic parameters [E0131]

tests/ui/entry-point/main-with-lifetime-param.stderr

@@ -1,7 +1,7 @@
 error[E0131]: `main` function is not allowed to have generic parameters
-  --> $DIR/issue-51022.rs:1:8
+  --> $DIR/main-with-lifetime-param.rs:3:8
    |
-LL | fn main<'a>() { }
+LL | fn main<'a>() {}
    |        ^^^^ `main` cannot have generic parameters
 
 error: aborting due to 1 previous error

tests/ui/fn-main/wrong-type.rs

@@ -1,8 +0,0 @@
-struct S {
-    x: isize,
-    y: isize,
-}
-
-fn main(foo: S) {
-//~^ ERROR: `main` function has wrong type [E0580]
-}

tests/ui/fn-main/wrong-type.stderr

@@ -1,12 +0,0 @@
-error[E0580]: `main` function has wrong type
-  --> $DIR/wrong-type.rs:6:1
-   |
-LL | fn main(foo: S) {
-   | ^^^^^^^^^^^^^^^ incorrect number of function parameters
-   |
-   = note: expected signature `fn()`
-              found signature `fn(S)`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0580`.

tests/ui/issues/issue-50688.rs

@@ -1,3 +0,0 @@
-fn main() {
-    [1; || {}]; //~ ERROR mismatched types
-}

tests/ui/issues/issue-51022.rs

@@ -1,2 +0,0 @@
-fn main<'a>() { }
-    //~^ ERROR `main` function is not allowed to have generic parameters [E0131]

tests/ui/mismatched_types/array-len-is-closure.rs

@@ -0,0 +1,5 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/50688>
+
+fn main() {
+    [1; || {}]; //~ ERROR mismatched types
+}

tests/ui/mismatched_types/array-len-is-closure.stderr

@@ -1,11 +1,11 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-50688.rs:2:9
+  --> $DIR/array-len-is-closure.rs:4:9
    |
 LL |     [1; || {}];
    |         ^^^^^ expected `usize`, found closure
    |
    = note: expected type `usize`
-           found closure `{closure@$DIR/issue-50688.rs:2:9: 2:11}`
+           found closure `{closure@$DIR/array-len-is-closure.rs:4:9: 4:11}`
 
 error: aborting due to 1 previous error