Rollup merge of rust-lang#71370 - PankajChaudhary5:ErrorCode-E0696, r=GuillaumeGomez

Added detailed error code explanation for issue E0696 in Rust compiler.

Added proper error explanation for issue E0696 in the Rust compiler.
Error Code E0696

Sub Part of Issue rust-lang#61137

r? @GuillaumeGomez

Author: Dylan-DPC

src/librustc_error_codes/error_codes.rs

@@ -386,6 +386,7 @@ E0691: include_str!("./error_codes/E0691.md"),
 E0692: include_str!("./error_codes/E0692.md"),
 E0693: include_str!("./error_codes/E0693.md"),
 E0695: include_str!("./error_codes/E0695.md"),
+E0696: include_str!("./error_codes/E0696.md"),
 E0697: include_str!("./error_codes/E0697.md"),
 E0698: include_str!("./error_codes/E0698.md"),
 E0699: include_str!("./error_codes/E0699.md"),
@@ -604,7 +605,6 @@ E0753: include_str!("./error_codes/E0753.md"),
     E0687, // in-band lifetimes cannot be used in `fn`/`Fn` syntax
     E0688, // in-band lifetimes cannot be mixed with explicit lifetime binders
 //  E0694, // an unknown tool name found in scoped attributes
-    E0696, // `continue` pointing to a labeled block
 //  E0702, // replaced with a generic attribute input check
 //  E0707, // multiple elided lifetimes used in arguments of `async fn`
 //  E0709, // multiple different lifetimes used in arguments of `async fn`

src/librustc_error_codes/error_codes/E0696.md

@@ -0,0 +1,49 @@
+A function is using `continue` keyword incorrectly.
+
+Erroneous code example:
+
+```compile_fail,E0696
+fn continue_simple() {
+    'b: {
+        continue; // error!
+    }
+}
+fn continue_labeled() {
+    'b: {
+        continue 'b; // error!
+    }
+}
+fn continue_crossing() {
+    loop {
+        'b: {
+            continue; // error!
+        }
+    }
+}
+```
+
+Here we have used the `continue` keyword incorrectly. As we
+have seen above that `continue` pointing to a labeled block.
+
+To fix this we have to use the labeled block properly.
+For example:
+
+```
+fn continue_simple() {
+    'b: loop {
+        continue ; // ok!
+    }
+}
+fn continue_labeled() {
+    'b: loop {
+        continue 'b; // ok!
+    }
+}
+fn continue_crossing() {
+    loop {
+        'b: loop {
+            continue; // ok!
+        }
+    }
+}
+```

src/test/ui/label/label_break_value_continue.stderr

@@ -21,4 +21,5 @@ LL |             continue;
 
 error: aborting due to 3 previous errors
 
-For more information about this error, try `rustc --explain E0695`.
+Some errors have detailed explanations: E0695, E0696.
+For more information about an error, try `rustc --explain E0695`.