// In vim you can `:set tw=80` and use `gq` to wrap paragraphs. Use `:set tw=0` to disable.
register_long_diagnostics! {
+E0001: r##"
+## Note: this error code is no longer emitted by the compiler.
+
+This error suggests that the expression arm corresponding to the noted pattern
+will never be reached as for all possible values of the expression being
+matched, one of the preceding patterns will match.
+
+This means that perhaps some of the preceding patterns are too general, this
+one is too specific or the ordering is incorrect.
+
+For example, the following `match` block has too many arms:
+
+```compile_fail,E0001
+match Some(0) {
+ Some(bar) => {/* ... */}
+ x => {/* ... */} // This handles the `None` case
+ _ => {/* ... */} // All possible cases have already been handled
+}
+```
+
+`match` blocks have their patterns matched in order, so, for example, putting
+a wildcard arm above a more specific arm will make the latter arm irrelevant.
+
+Ensure the ordering of the match arm is correct and remove any superfluous
+arms.
+"##,
+
E0002: r##"
## Note: this error code is no longer emitted by the compiler.
// Test that diagnostic macros are gated by `rustc_diagnostic_macros` feature
// gate
-__register_diagnostic!(E0002);
+__register_diagnostic!(E0001);
//~^ ERROR macro undefined: '__register_diagnostic!'
fn main() {
- __diagnostic_used!(E0002);
+ __diagnostic_used!(E0001);
//~^ ERROR macro undefined: '__diagnostic_used!'
}