Fix error message for E0256 in certain cases.

src/librustc_resolve/resolve_imports.rs

@@ -12,6 +12,7 @@ use self::ImportDirectiveSubclass::*;
 
 use DefModifiers;
 use Module;
+use ModuleKind;
 use Namespace::{self, TypeNS, ValueNS};
 use NameBindings;
 use NamespaceResult::{BoundResult, UnboundResult, UnknownResult};
@@ -980,10 +981,14 @@ impl<'a, 'b:'a, 'tcx:'b> ImportResolver<'a, 'b, 'tcx> {
         match import_resolution.type_target {
             Some(ref target) if target.shadowable != Shadowable::Always => {
                 if let Some(ref ty) = *name_bindings.type_def.borrow() {
-                    let (what, note) = if ty.module_def.is_some() {
-                        ("existing submodule", "note conflicting module here")
-                    } else {
-                        ("type in this module", "note conflicting type here")
+                    let (what, note) = match ty.module_def {
+                        Some(ref module)
+                            if module.kind.get() == ModuleKind::NormalModuleKind =>
+                                ("existing submodule", "note conflicting module here"),
+                        Some(ref module)
+                            if module.kind.get() == ModuleKind::TraitModuleKind =>
+                                ("trait in this module", "note conflicting trait here"),
+                        _    => ("type in this module", "note conflicting type here"),
                     };
                     span_err!(self.resolver.session, import_span, E0256,
                               "import `{}` conflicts with {}",

src/test/compile-fail/issue-24081.rs

@@ -0,0 +1,23 @@
+// 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.
+
+use std::ops::Add; //~ ERROR import `Add` conflicts with type in this module
+use std::ops::Sub; //~ ERROR import `Sub` conflicts with type in this module
+use std::ops::Mul; //~ ERROR import `Mul` conflicts with type in this module
+use std::ops::Div; //~ ERROR import `Div` conflicts with existing submodule
+use std::ops::Rem; //~ ERROR import `Rem` conflicts with trait in this module
+
+type Add = bool;
+struct Sub { x: f32 }
+enum Mul { A, B }
+mod Div { }
+trait Rem { }
+
+fn main() {}