`#[diagnostic::on_unimplemented]` without filters

This commit adds support for a `#[diagnostic::on_unimplemented]`
attribute with the following options:

* `message` to customize the primary error message
* `note` to add a customized note message to an error message
* `label` to customize the label part of the error message

Co-authored-by: León Orell Valerian Liehr <me@fmease.dev>
Co-authored-by: Michael Goulet <michael@errs.io>

1 files changed, 16 insertions, 0 deletions

diff --git a/compiler/rustc_ast/src/attr/mod.rs b/compiler/rustc_ast/src/attr/mod.rs
index 19a2b3017bc..db008ea139d 100644
--- a/compiler/rustc_ast/src/attr/mod.rs
+++ b/compiler/rustc_ast/src/attr/mod.rs
@@ -99,6 +99,22 @@ impl Attribute {
         }
     }
 
+    pub fn path_matches(&self, name: &[Symbol]) -> bool {
+        match &self.kind {
+            AttrKind::Normal(normal) => {
+                normal.item.path.segments.len() == name.len()
+                    && normal
+                        .item
+                        .path
+                        .segments
+                        .iter()
+                        .zip(name)
+                        .all(|(s, n)| s.args.is_none() && s.ident.name == *n)
+            }
+            AttrKind::DocComment(..) => false,
+        }
+    }
+
     pub fn is_word(&self) -> bool {
         if let AttrKind::Normal(normal) = &self.kind {
             matches!(normal.item.args, AttrArgs::Empty)