Handle structured stable attribute 'since' version in rustdoc

2 files changed, 25 insertions, 12 deletions

diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index 6a7410144fd..449aac4cfc8 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -12,7 +12,7 @@ use thin_vec::ThinVec;
 
 use rustc_ast as ast;
 use rustc_ast_pretty::pprust;
-use rustc_attr::{ConstStability, Deprecation, Stability, StabilityLevel};
+use rustc_attr::{ConstStability, Deprecation, Since, Stability, StabilityLevel};
 use rustc_const_eval::const_eval::is_unstable_const_fn;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir as hir;
@@ -585,14 +585,14 @@ impl Item {
         })
     }
 
-    pub(crate) fn stable_since(&self, tcx: TyCtxt<'_>) -> Option<Symbol> {
+    pub(crate) fn stable_since(&self, tcx: TyCtxt<'_>) -> Option<Since> {
         match self.stability(tcx)?.level {
             StabilityLevel::Stable { since, .. } => Some(since),
             StabilityLevel::Unstable { .. } => None,
         }
     }
 
-    pub(crate) fn const_stable_since(&self, tcx: TyCtxt<'_>) -> Option<Symbol> {
+    pub(crate) fn const_stable_since(&self, tcx: TyCtxt<'_>) -> Option<Since> {
         match self.const_stability(tcx)?.level {
             StabilityLevel::Stable { since, .. } => Some(since),
             StabilityLevel::Unstable { .. } => None,
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 89e29d8b59b..1aad014c571 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -48,7 +48,7 @@ use std::str;
 use std::string::ToString;
 
 use askama::Template;
-use rustc_attr::{ConstStability, Deprecation, StabilityLevel};
+use rustc_attr::{rust_version_symbol, ConstStability, Deprecation, Since, StabilityLevel};
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir::def_id::{DefId, DefIdSet};
@@ -911,13 +911,17 @@ fn assoc_method(
 /// consequence of the above rules.
 fn render_stability_since_raw_with_extra(
     w: &mut Buffer,
-    ver: Option<Symbol>,
+    ver: Option<Since>,
     const_stability: Option<ConstStability>,
-    containing_ver: Option<Symbol>,
-    containing_const_ver: Option<Symbol>,
+    containing_ver: Option<Since>,
+    containing_const_ver: Option<Since>,
     extra_class: &str,
 ) -> bool {
-    let stable_version = ver.filter(|inner| !inner.is_empty() && Some(*inner) != containing_ver);
+    let stable_version = if ver != containing_ver && let Some(ver) = &ver {
+        since_to_string(ver)
+    } else {
+        None
+    };
 
     let mut title = String::new();
     let mut stability = String::new();
@@ -931,7 +935,8 @@ fn render_stability_since_raw_with_extra(
         Some(ConstStability { level: StabilityLevel::Stable { since, .. }, .. })
             if Some(since) != containing_const_ver =>
         {
-            Some((format!("const since {since}"), format!("const: {since}")))
+            since_to_string(&since)
+                .map(|since| (format!("const since {since}"), format!("const: {since}")))
         }
         Some(ConstStability { level: StabilityLevel::Unstable { issue, .. }, feature, .. }) => {
             let unstable = if let Some(n) = issue {
@@ -971,13 +976,21 @@ fn render_stability_since_raw_with_extra(
     !stability.is_empty()
 }
 
+fn since_to_string(since: &Since) -> Option<String> {
+    match since {
+        Since::Version(since) => Some(since.to_string()),
+        Since::Current => Some(rust_version_symbol().to_string()),
+        Since::Err => None,
+    }
+}
+
 #[inline]
 fn render_stability_since_raw(
     w: &mut Buffer,
-    ver: Option<Symbol>,
+    ver: Option<Since>,
     const_stability: Option<ConstStability>,
-    containing_ver: Option<Symbol>,
-    containing_const_ver: Option<Symbol>,
+    containing_ver: Option<Since>,
+    containing_const_ver: Option<Since>,
 ) -> bool {
     render_stability_since_raw_with_extra(
         w,