Fix #23589

src/librustc_typeck/astconv.rs

@@ -291,10 +291,13 @@ pub fn ast_path_substs_for_ty<'tcx>(
         ast::AngleBracketedParameters(ref data) => {
             convert_angle_bracketed_parameters(this, rscope, span, decl_generics, data)
         }
-        ast::ParenthesizedParameters(ref data) => {
+        ast::ParenthesizedParameters(..) => {
             span_err!(tcx.sess, span, E0214,
-                "parenthesized parameters may only be used with a trait");
-            convert_parenthesized_parameters(this, rscope, span, decl_generics, data)
+                      "parenthesized parameters may only be used with a trait");
+            let ty_param_defs = decl_generics.types.get_slice(TypeSpace);
+            (Substs::empty(),
+             ty_param_defs.iter().map(|_| tcx.types.err).collect(),
+             vec![])
         }
     };
 

src/test/compile-fail/issue-23589.rs

@@ -0,0 +1,14 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    let v: Vec(&str) = vec!['1', '2'];
+    //~^ ERROR parenthesized parameters may only be used with a trait
+}

src/test/compile-fail/unboxed-closure-sugar-used-on-struct-1.rs

@@ -18,7 +18,6 @@ struct Bar<A> {
 fn bar() {
     let x: Box<Bar()> = panic!();
     //~^ ERROR parenthesized parameters may only be used with a trait
-    //~^^ ERROR associated type bindings are not allowed here
 }
 
 fn main() { }

src/test/compile-fail/unboxed-closure-sugar-used-on-struct.rs

@@ -16,7 +16,6 @@ struct Bar<A> {
 
 fn foo(b: Box<Bar()>) {
     //~^ ERROR parenthesized parameters may only be used with a trait
-    //~^^ ERROR associated type bindings are not allowed here
 }
 
 fn main() { }