Stabilization change for mod.rs

This change is in response to #53125.
The patch makes the feature accepted and removes the tests that tested the
non-accepted status of the feature.

Author: blitzerr

Diff for: src/libsyntax/feature_gate.rs

@@ -37,7 +37,7 @@ use visit::{self, FnKind, Visitor};
 use parse::ParseSess;
 use symbol::{keywords, Symbol};
 
-use std::{env, path};
+use std::{env};
 
 macro_rules! set {
     // The const_fn feature also enables the min_const_fn feature, because `min_const_fn` allows
@@ -409,9 +409,6 @@ declare_features! (
     // Resolve absolute paths as paths from other crates
     (active, extern_absolute_paths, "1.24.0", Some(44660), Some(Edition::Edition2018)),
 
-    // `foo.rs` as an alternative to `foo/mod.rs`
-    (active, non_modrs_mods, "1.24.0", Some(44660), Some(Edition::Edition2018)),
-
     // `extern` in paths
     (active, extern_in_paths, "1.23.0", Some(44660), None),
 
@@ -660,6 +657,8 @@ declare_features! (
     (accepted, repr_transparent, "1.28.0", Some(43036), None),
     // Defining procedural macros in `proc-macro` crates
     (accepted, proc_macro, "1.29.0", Some(38356), None),
+    // `foo.rs` as an alternative to `foo/mod.rs`
+    (accepted, non_modrs_mods, "1.30.0", Some(44660), None),
     // Allows use of the :vis macro fragment specifier
     (accepted, macro_vis_matcher, "1.30.0", Some(41022), None),
     // Allows importing and reexporting macros with `use`,
@@ -1494,31 +1493,6 @@ impl<'a> PostExpansionVisitor<'a> {
     }
 }
 
-impl<'a> PostExpansionVisitor<'a> {
-    fn whole_crate_feature_gates(&mut self, _krate: &ast::Crate) {
-        for &(ident, span) in &*self.context.parse_sess.non_modrs_mods.borrow() {
-            if !span.allows_unstable() {
-                let cx = &self.context;
-                let level = GateStrength::Hard;
-                let has_feature = cx.features.non_modrs_mods;
-                let name = "non_modrs_mods";
-                debug!("gate_feature(feature = {:?}, span = {:?}); has? {}",
-                        name, span, has_feature);
-
-                if !has_feature && !span.allows_unstable() {
-                    leveled_feature_err(
-                        cx.parse_sess, name, span, GateIssue::Language,
-                        "mod statements in non-mod.rs files are unstable", level
-                    )
-                    .help(&format!("on stable builds, rename this file to {}{}mod.rs",
-                                   ident, path::MAIN_SEPARATOR))
-                    .emit();
-                }
-            }
-        }
-    }
-}
-
 impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
     fn visit_attribute(&mut self, attr: &ast::Attribute) {
         if !attr.span.allows_unstable() {
@@ -2088,7 +2062,6 @@ pub fn check_crate(krate: &ast::Crate,
     };
 
     let visitor = &mut PostExpansionVisitor { context: &ctx };
-    visitor.whole_crate_feature_gates(krate);
     visit::walk_crate(visitor, krate);
 }