diff --git a/src/librustc_plugin/registry.rs b/src/librustc_plugin/registry.rs
index 2ed6f868fa1e..967fdcd2e7d4 100644
--- a/src/librustc_plugin/registry.rs
+++ b/src/librustc_plugin/registry.rs
@@ -4,7 +4,7 @@ use rustc::lint::{EarlyLintPassObject, LateLintPassObject, LintId, Lint};
 use rustc::session::Session;
 use rustc::util::nodemap::FxHashMap;
 
-use syntax::ext::base::{SyntaxExtension, NamedSyntaxExtension, NormalTT, IdentTT};
+use syntax::ext::base::{SyntaxExtension, NamedSyntaxExtension, NormalTT};
 use syntax::ext::base::MacroExpanderFn;
 use syntax::symbol::{Symbol, sym};
 use syntax::ast;
@@ -109,9 +109,6 @@ impl<'a> Registry<'a> {
                     edition,
                 }
             }
-            IdentTT { expander, span: _, allow_internal_unstable } => {
-                IdentTT { expander, span: Some(self.krate_span), allow_internal_unstable }
-            }
             _ => extension,
         }));
     }
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index 61c736662c71..ffc321279244 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -288,34 +288,6 @@ impl<F> TTMacroExpander for F
     }
 }
 
-pub trait IdentMacroExpander {
-    fn expand<'cx>(&self,
-                   cx: &'cx mut ExtCtxt<'_>,
-                   sp: Span,
-                   ident: ast::Ident,
-                   token_tree: Vec<tokenstream::TokenTree>)
-                   -> Box<dyn MacResult+'cx>;
-}
-
-pub type IdentMacroExpanderFn =
-    for<'cx> fn(&'cx mut ExtCtxt<'_>, Span, ast::Ident, Vec<tokenstream::TokenTree>)
-                -> Box<dyn MacResult+'cx>;
-
-impl<F> IdentMacroExpander for F
-    where F : for<'cx> Fn(&'cx mut ExtCtxt<'_>, Span, ast::Ident,
-                          Vec<tokenstream::TokenTree>) -> Box<dyn MacResult+'cx>
-{
-    fn expand<'cx>(&self,
-                   cx: &'cx mut ExtCtxt<'_>,
-                   sp: Span,
-                   ident: ast::Ident,
-                   token_tree: Vec<tokenstream::TokenTree>)
-                   -> Box<dyn MacResult+'cx>
-    {
-        (*self)(cx, sp, ident, token_tree)
-    }
-}
-
 // Use a macro because forwarding to a simple function has type system issues
 macro_rules! make_stmts_default {
     ($me:expr) => {
@@ -658,14 +630,6 @@ pub enum SyntaxExtension {
         edition: Edition,
     },
 
-    /// A function-like syntax extension that has an extra ident before
-    /// the block.
-    IdentTT {
-        expander: Box<dyn IdentMacroExpander + sync::Sync + sync::Send>,
-        span: Option<Span>,
-        allow_internal_unstable: Option<Lrc<[Symbol]>>,
-    },
-
     /// An attribute-like procedural macro. TokenStream -> TokenStream.
     /// The input is the annotated item.
     /// Allows generating code to implement a Trait for a given struct
@@ -691,7 +655,6 @@ impl SyntaxExtension {
         match *self {
             SyntaxExtension::DeclMacro { .. } |
             SyntaxExtension::NormalTT { .. } |
-            SyntaxExtension::IdentTT { .. } |
             SyntaxExtension::ProcMacro { .. } =>
                 MacroKind::Bang,
             SyntaxExtension::NonMacroAttr { .. } |
@@ -725,7 +688,6 @@ impl SyntaxExtension {
             SyntaxExtension::ProcMacroDerive(.., edition) => edition,
             // Unstable legacy stuff
             SyntaxExtension::NonMacroAttr { .. } |
-            SyntaxExtension::IdentTT { .. } |
             SyntaxExtension::MultiDecorator(..) |
             SyntaxExtension::MultiModifier(..) |
             SyntaxExtension::BuiltinDerive(..) => default_edition,
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 996053955533..008bcaab8891 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -791,28 +791,6 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                 }
             }
 
-            IdentTT { ref expander, span: tt_span, ref allow_internal_unstable } => {
-                if ident.name == kw::Invalid {
-                    self.cx.span_err(path.span,
-                                    &format!("macro {}! expects an ident argument", path));
-                    self.cx.trace_macros_diag();
-                    kind.dummy(span)
-                } else {
-                    invoc.expansion_data.mark.set_expn_info(ExpnInfo {
-                        call_site: span,
-                        def_site: tt_span,
-                        format: macro_bang_format(path),
-                        allow_internal_unstable: allow_internal_unstable.clone(),
-                        allow_internal_unsafe: false,
-                        local_inner_macros: false,
-                        edition: self.cx.parse_sess.edition,
-                    });
-
-                    let input: Vec<_> = mac.node.stream().into_trees().collect();
-                    kind.make_from(expander.expand(self.cx, span, ident, input))
-                }
-            }
-
             MultiDecorator(..) | MultiModifier(..) |
             AttrProcMacro(..) | SyntaxExtension::NonMacroAttr { .. } => {
                 self.cx.span_err(path.span,