dividied closure-no-fn.rs into three different tests

Author: Christian Poveda

src/test/compile-fail/closure-no-fn.rs renamed to src/test/compile-fail/closure-no-fn-1.rs

@@ -15,10 +15,4 @@ fn main() {
     let mut a = 0u8;
     let foo: fn(u8) -> u8 = |v: u8| { a += v; a };
     //~^ ERROR mismatched types
-    let b = 0u8;
-    let bar: fn() -> u8 = || { b };
-    //~^ ERROR mismatched types
-    let baz: fn() -> u8 = || { b } as fn() -> u8;
-    //~^ ERROR mismatched types
-    //~^^ ERROR non-scalar cast
 }

src/test/compile-fail/closure-no-fn-2.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Ensure that capturing closures are never coerced to fns
+// Especially interesting as non-capturing closures can be.
+
+fn main() {
+    let b = 0u8;
+    let bar: fn() -> u8 = || { b };
+    //~^ ERROR mismatched types
+}

src/test/compile-fail/closure-no-fn-3.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Ensure that capturing closures are never coerced to fns
+// Especially interesting as non-capturing closures can be.
+
+fn main() {
+    let b = 0u8;
+    let baz: fn() -> u8 = (|| { b }) as fn() -> u8;
+    //~^ ERROR non-scalar cast
+}