Implement RFC 3503: frontmatters

Supercedes #137193
2025-04-12 15:53:46 +00:00
parent 0c33fe2c3d
commit 662182637e
61 changed files with 970 additions and 22 deletions
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -506,6 +506,8 @@ declare_features! (
    (incomplete, fn_delegation, "1.76.0", Some(118212)),
    /// Allows impls for the Freeze trait.
    (internal, freeze_impls, "1.78.0", Some(121675)),
+    /// Frontmatter `---` blocks for use by external tools.
+    (unstable, frontmatter, "CURRENT_RUSTC_VERSION", Some(136889)),
    /// Allows defining gen blocks and `gen fn`.
    (unstable, gen_blocks, "1.75.0", Some(117078)),
    /// Infer generic args for both consts and types.