Rollup merge of #45880 - arielb1:never-coerce, r=nikomatsakis

make coercions to `!` in unreachable code a hard error

This was added to cover up a lazy extra semicolon in #35849, but does
not actually make sense. This is removed as a part of the stabilization
of `never_type`.

src/test/compile-fail/coerce-to-bang-cast.rs

@@ -12,8 +12,11 @@
 
 fn foo(x: usize, y: !, z: usize) { }
 
+#[deny(coerce_never)]
 fn cast_a() {
     let y = {return; 22} as !;
+    //~^ ERROR cannot coerce `i32` to !
+    //~| hard error
 }
 
 fn cast_b() {

src/test/compile-fail/coerce-to-bang.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(never_type)]
+#![deny(coerce_never)]
 
 fn foo(x: usize, y: !, z: usize) { }
 
@@ -17,6 +18,8 @@ fn call_foo_a() {
     // the coercion to `!`, but within same expression. Not clear that
     // these are the rules we want.
     foo(return, 22, 44);
+    //~^ ERROR cannot coerce `{integer}` to !
+    //~| hard error
 }
 
 fn call_foo_b() {
@@ -36,6 +39,8 @@ fn call_foo_d() {
     let b = 22;
     let c = 44;
     foo(a, b, c); // ... and hence a reference to `a` is expected to diverge.
+    //~^ ERROR cannot coerce `{integer}` to !
+    //~| hard error
 }
 
 fn call_foo_e() {
@@ -75,6 +80,8 @@ fn tuple_a() {
 fn tuple_b() {
     // Divergence happens before coercion: OK
     let x: (usize, !, usize) = (return, 44, 66);
+    //~^ ERROR cannot coerce `{integer}` to !
+    //~| hard error
 }
 
 fn tuple_c() {

src/test/compile-fail/diverging-fn-tail-35849.rs

@@ -8,9 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-fn _converge() -> ! {
-    42 //~ ERROR mismatched types
+#[deny(coerce_never)]
+fn assert_sizeof() -> ! {
+    unsafe {
+        ::std::mem::transmute::<f64, [u8; 8]>(panic!())
+            //~^ ERROR cannot coerce `[u8; 8]` to !
+            //~| hard error
+    }
 }
 
 fn main() { }
-

src/test/run-pass/diverging-fn-tail-35849.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#[allow(coerce_never)]
 fn assert_sizeof() -> ! {
     unsafe {
         ::std::mem::transmute::<f64, [u8; 8]>(panic!())
@@ -15,4 +16,3 @@ fn assert_sizeof() -> ! {
 }
 
 fn main() { }
-

src/test/ui/reachable/expr_unary.rs

@@ -12,11 +12,14 @@
 #![allow(unused_assignments)]
 #![allow(dead_code)]
 #![deny(unreachable_code)]
+#![deny(coerce_never)]
 #![feature(never_type)]
 
 fn foo() {
     let x: ! = ! { return; 22 }; //~ ERROR unreachable
-    //~^ ERROR cannot apply unary operator `!` to type `!`
+    //~^ ERROR cannot coerce
+    //~| hard error
+    //~| ERROR cannot apply unary operator `!` to type `!`
 }
 
 fn main() { }

src/test/ui/reachable/expr_unary.stderr

@@ -1,7 +1,7 @@
 error: unreachable expression
-  --> $DIR/expr_unary.rs:18:28
+  --> $DIR/expr_unary.rs:19:28
    |
-18 |     let x: ! = ! { return; 22 }; //~ ERROR unreachable
+19 |     let x: ! = ! { return; 22 }; //~ ERROR unreachable
    |                            ^^
    |
 note: lint level defined here
@@ -10,11 +10,25 @@ note: lint level defined here
 14 | #![deny(unreachable_code)]
    |         ^^^^^^^^^^^^^^^^
 
-error[E0600]: cannot apply unary operator `!` to type `!`
-  --> $DIR/expr_unary.rs:18:16
+error: cannot coerce `{integer}` to !
+  --> $DIR/expr_unary.rs:19:28
    |
-18 |     let x: ! = ! { return; 22 }; //~ ERROR unreachable
+19 |     let x: ! = ! { return; 22 }; //~ ERROR unreachable
+   |                            ^^
+   |
+note: lint level defined here
+  --> $DIR/expr_unary.rs:15:9
+   |
+15 | #![deny(coerce_never)]
+   |         ^^^^^^^^^^^^
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #46325 <https://github.com/rust-lang/rust/issues/46325>
+
+error[E0600]: cannot apply unary operator `!` to type `!`
+  --> $DIR/expr_unary.rs:19:16
+   |
+19 |     let x: ! = ! { return; 22 }; //~ ERROR unreachable
    |                ^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors