Rollup merge of #146172 - RalfJung:triagebot-keyword-mentions, r=Urgau

triagebot: configure some pings when certain attributes are used

Let's try this out in practice. :)

Cc `@rust-lang/miri` `@rust-lang/wg-const-eval` `@Urgau`

Author: Zalathar

src/tools/tidy/src/triagebot.rs

@@ -19,7 +19,12 @@ pub fn check(path: &Path, bad: &mut bool) {
 
     // Check [mentions."*"] sections, i.e. [mentions."compiler/rustc_const_eval/src/"]
     if let Some(Value::Table(mentions)) = config.get("mentions") {
-        for path_str in mentions.keys() {
+        for (entry_key, entry_val) in mentions.iter() {
+            // If the type is set to something other than "filename", then this is not a path.
+            if entry_val.get("type").is_some_and(|t| t.as_str().unwrap_or_default() != "filename") {
+                continue;
+            }
+            let path_str = entry_key;
             // Remove quotes from the path
             let clean_path = path_str.trim_matches('"');
             let full_path = path.join(clean_path);

triagebot.toml

@@ -1306,6 +1306,21 @@ cc = ["@m-ou-se"]
 [mentions."compiler/rustc_ast_lowering/src/format.rs"]
 cc = ["@m-ou-se"]
 
+[mentions."#[miri::intrinsic_fallback_is_spec]"]
+type = "content"
+message = """
+`#[miri::intrinsic_fallback_is_spec]` must only be used if the function actively checks for all UB cases,
+and explores the possible non-determinism of the intrinsic.
+"""
+cc = ["@rust-lang/miri"]
+[mentions."#[rustc_allow_const_fn_unstable]"]
+type = "content"
+message = """
+`#[rustc_allow_const_fn_unstable]` needs careful audit to avoid accidentally exposing unstable
+implementation details on stable.
+"""
+cc = ["@rust-lang/wg-const-eval"]
+
 
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