Rollup merge of #101473 - nnethercote:mir-size-assertions, r=lqd

[rust.git] / compiler / rustc_attr / src / builtin.rs

diff --git a/compiler/rustc_attr/src/builtin.rs b/compiler/rustc_attr/src/builtin.rs
index 65edab78ce74ece4c3b2cb1098b7db250851346b..e1404ab15efa37add14cfed8823837b20c016c7a 100644 (file)
--- a/compiler/rustc_attr/src/builtin.rs
+++ b/compiler/rustc_attr/src/builtin.rs
@@ -15,6 +15,12 @@
 
 use crate::session_diagnostics::{self, IncorrectReprFormatGenericCause};
 
+/// The version placeholder that recently stabilized features contain inside the
+/// `since` field of the `#[stable]` attribute.
+///
+/// For more, see [this pull request](https://github.com/rust-lang/rust/pull/100591).
+pub const VERSION_PLACEHOLDER: &str = "CURRENT_RUSTC_VERSION";
+
 pub fn is_builtin_attr(attr: &Attribute) -> bool {
     attr.is_doc_comment() || attr.ident().filter(|ident| is_builtin_attr_name(ident.name)).is_some()
 }
@@ -57,7 +63,12 @@ fn handle_errors(sess: &ParseSess, span: Span, error: AttrError) {
             sess.emit_err(session_diagnostics::MultipleStabilityLevels { span });
         }
         AttrError::UnsupportedLiteral(reason, is_bytestr) => {
-            sess.emit_err(session_diagnostics::UnsupportedLiteral { span, reason, is_bytestr });
+            sess.emit_err(session_diagnostics::UnsupportedLiteral {
+                span,
+                reason,
+                is_bytestr,
+                start_point_span: sess.source_map().start_point(span),
+            });
         }
     }
 }
@@ -483,6 +494,12 @@ fn find_stability_generic<'a, I>(
                         }
                     }
 
+                    if let Some(s) = since && s.as_str() == VERSION_PLACEHOLDER {
+                        let version = option_env!("CFG_VERSION").unwrap_or("<current>");
+                        let version = version.split(' ').next().unwrap();
+                        since = Some(Symbol::intern(&version));
+                    }
+
                     match (feature, since) {
                         (Some(feature), Some(since)) => {
                             let level = Stable { since, allowed_through_unstable_modules: false };