Revert "pre-expansion gate associated_type_bounds"

This reverts commit c17a1fd7d0ef0f1f546445d0c8bdb11be55e4be7.

1 files changed, 14 insertions, 1 deletions

diff --git a/src/libsyntax/feature_gate/check.rs b/src/libsyntax/feature_gate/check.rs
index 184a38dfaed..a4fc6114b98 100644
--- a/src/libsyntax/feature_gate/check.rs
+++ b/src/libsyntax/feature_gate/check.rs
@@ -3,7 +3,10 @@ use super::accepted::ACCEPTED_FEATURES;
 use super::removed::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
 use super::builtin_attrs::{AttributeGate, BUILTIN_ATTRIBUTE_MAP};
 
-use crate::ast::{self, NodeId, GenericParam, GenericParamKind, PatKind, RangeEnd, VariantData};
+use crate::ast::{
+    self, AssocTyConstraint, AssocTyConstraintKind, NodeId, GenericParam, GenericParamKind,
+    PatKind, RangeEnd, VariantData,
+};
 use crate::attr::{self, check_builtin_attribute};
 use crate::source_map::Spanned;
 use crate::edition::{ALL_EDITIONS, Edition};
@@ -604,6 +607,16 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
         visit::walk_generic_param(self, param)
     }
 
+    fn visit_assoc_ty_constraint(&mut self, constraint: &'a AssocTyConstraint) {
+        match constraint.kind {
+            AssocTyConstraintKind::Bound { .. } =>
+                gate_feature_post!(&self, associated_type_bounds, constraint.span,
+                    "associated type bounds are unstable"),
+            _ => {}
+        }
+        visit::walk_assoc_ty_constraint(self, constraint)
+    }
+
     fn visit_trait_item(&mut self, ti: &'a ast::TraitItem) {
         match ti.kind {
             ast::TraitItemKind::Method(ref sig, ref block) => {