rustc: Remove support for old_impl_check

This commit removes compiler support for the `old_impl_check` attribute which
should in theory be entirely removed now. The last remaining use of it in the
standard library has been updated by moving the type parameter on the
`old_io::Acceptor` trait into an associated type. As a result, this is a
breaking change for all current users of the deprecated `old_io::Acceptor`
trait. Code can be migrated by using the `Connection` associated type instead.

[breaking-change]

1 files changed, 0 insertions, 11 deletions

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 60f81dac1e9..0f281c6f8f9 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -102,9 +102,6 @@ const KNOWN_FEATURES: &'static [(&'static str, &'static str, Status)] = &[
     // A way to temporarily opt out of the new orphan rules. This will *never* be accepted.
     ("old_orphan_check", "1.0.0", Deprecated),
 
-    // A way to temporarily opt out of the new impl rules. This will *never* be accepted.
-    ("old_impl_check", "1.0.0", Deprecated),
-
     // OIBIT specific features
     ("optin_builtin_traits", "1.0.0", Active),
 
@@ -280,7 +277,6 @@ pub const KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
 
     // FIXME: #19470 this shouldn't be needed forever
     ("old_orphan_check", Whitelisted),
-    ("old_impl_check", Whitelisted),
     ("rustc_paren_sugar", Whitelisted), // FIXME: #18101 temporary unboxed closure hack
 
     // Crate level attributes
@@ -595,13 +591,6 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
                         i.span,
                         "the new orphan check rules will eventually be strictly enforced");
                 }
-
-                if attr::contains_name(&i.attrs[..],
-                                       "old_impl_check") {
-                    self.gate_feature("old_impl_check",
-                                      i.span,
-                                      "`#[old_impl_check]` will be removed in the future");
-                }
             }
 
             _ => {}