Add tests for uninhabited types

Author: varkor

src/test/ui/break-diverging-value.rs

@@ -1,3 +1,5 @@
+#![feature(never_type)]
+
 fn loop_break_return() -> i32 {
     let loop_value = loop { break return 0 }; // ok
 }
@@ -10,4 +12,27 @@ fn loop_break_break() -> i32 { //~ ERROR mismatched types
     let loop_value = loop { break break };
 }
 
+fn loop_break_return_2() -> i32 { //~ ERROR mismatched types
+    let loop_value = loop { break { return; () } };
+    //~^ ERROR `return;` in a function whose return type is not `()`
+}
+
+enum Void {}
+
+fn get_void() -> Void {
+    panic!()
+}
+
+fn loop_break_void() -> i32 { //~ ERROR mismatched types
+    let loop_value = loop { break get_void() };
+}
+
+fn get_never() -> ! {
+    panic!()
+}
+
+fn loop_break_never() -> i32 {
+    let loop_value = loop { break get_never() }; // ok
+}
+
 fn main() {}

src/test/ui/break-diverging-value.stderr

@@ -1,11 +1,34 @@
 error[E0308]: mismatched types
-  --> $DIR/break-diverging-value.rs:9:26
+  --> $DIR/break-diverging-value.rs:11:26
    |
 LL | fn loop_break_break() -> i32 {
    |    ----------------      ^^^ expected `i32`, found `()`
    |    |
    |    implicitly returns `()` as its body has no tail or `return` expression
 
-error: aborting due to previous error
+error[E0069]: `return;` in a function whose return type is not `()`
+  --> $DIR/break-diverging-value.rs:16:37
+   |
+LL |     let loop_value = loop { break { return; () } };
+   |                                     ^^^^^^ return type is not `()`
+
+error[E0308]: mismatched types
+  --> $DIR/break-diverging-value.rs:15:29
+   |
+LL | fn loop_break_return_2() -> i32 {
+   |    -------------------      ^^^ expected `i32`, found `()`
+   |    |
+   |    implicitly returns `()` as its body has no tail or `return` expression
+
+error[E0308]: mismatched types
+  --> $DIR/break-diverging-value.rs:26:25
+   |
+LL | fn loop_break_void() -> i32 {
+   |    ---------------      ^^^ expected `i32`, found `()`
+   |    |
+   |    implicitly returns `()` as its body has no tail or `return` expression
+
+error: aborting due to 4 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0069, E0308.
+For more information about an error, try `rustc --explain E0069`.