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diff --git a/src/test/incremental/hashes/trait_impls.rs b/src/test/incremental/hashes/trait_impls.rs
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+// Copyright 2016 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.
+
+
+// This test case tests the incremental compilation hash (ICH) implementation
+// for let expressions.
+
+// The general pattern followed here is: Change one thing between rev1 and rev2
+// and make sure that the hash has changed, then change nothing between rev2 and
+// rev3 and make sure that the hash has not changed.
+
+// must-compile-successfully
+// revisions: cfail1 cfail2 cfail3
+// compile-flags: -Z query-dep-graph
+
+
+#![allow(warnings)]
+#![feature(rustc_attrs)]
+#![feature(specialization)]
+#![crate_type="rlib"]
+
+struct Foo;
+
+// Change Method Name -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait ChangeMethodNameTrait {
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl ChangeMethodNameTrait for Foo {
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+pub trait ChangeMethodNameTrait {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name2();
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeMethodNameTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name2() { }
+}
+
+// Change Method Body -----------------------------------------------------------
+//
+// This should affect the method itself, but not the trait.
+
+pub trait ChangeMethodBodyTrait {
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl ChangeMethodBodyTrait for Foo {
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_clean(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeMethodBodyTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name() {
+        ()
+    }
+}
+
+// Change Method Selfness -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait ChangeMethodSelfnessTrait {
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl ChangeMethodSelfnessTrait for Foo {
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+pub trait ChangeMethodSelfnessTrait {
+    fn method_name(&self);
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeMethodSelfnessTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name(&self) {
+        ()
+    }
+}
+
+// Change Method Selfness -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait RemoveMethodSelfnessTrait {
+    fn method_name(&self);
+}
+
+#[cfg(cfail1)]
+impl RemoveMethodSelfnessTrait for Foo {
+    fn method_name(&self) { }
+}
+
+#[cfg(not(cfail1))]
+pub trait RemoveMethodSelfnessTrait {
+    fn method_name();
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl RemoveMethodSelfnessTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name() {
+        ()
+    }
+}
+
+// Change Method Selfmutness -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait ChangeMethodSelfmutnessTrait {
+    fn method_name(&self);
+}
+
+#[cfg(cfail1)]
+impl ChangeMethodSelfmutnessTrait for Foo {
+    fn method_name(&self) { }
+}
+
+#[cfg(not(cfail1))]
+pub trait ChangeMethodSelfmutnessTrait {
+    fn method_name(&mut self);
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeMethodSelfmutnessTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name(&mut self) {
+        ()
+    }
+}
+
+// Change item kind -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait ChangeItemKindTrait {
+    fn name();
+}
+
+#[cfg(cfail1)]
+impl ChangeItemKindTrait for Foo {
+    fn name() { }
+}
+
+#[cfg(not(cfail1))]
+pub trait ChangeItemKindTrait {
+    type name;
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeItemKindTrait for Foo {
+    type name = ();
+}
+
+// Remove item -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait RemoveItemTrait {
+    type TypeName;
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl RemoveItemTrait for Foo {
+    type TypeName = ();
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+pub trait RemoveItemTrait {
+    type TypeName;
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl RemoveItemTrait for Foo {
+    type TypeName = ();
+}
+
+// Add item -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait AddItemTrait {
+    type TypeName;
+}
+
+#[cfg(cfail1)]
+impl AddItemTrait for Foo {
+    type TypeName = ();
+}
+
+#[cfg(not(cfail1))]
+pub trait AddItemTrait {
+    type TypeName;
+    fn method_name();
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl AddItemTrait for Foo {
+    type TypeName = ();
+    fn method_name() { }
+}
+
+// Change has-value -----------------------------------------------------------
+
+#[cfg(cfail1)]
+pub trait ChangeHasValueTrait {
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl ChangeHasValueTrait for Foo {
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+pub trait ChangeHasValueTrait {
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeHasValueTrait for Foo {
+    fn method_name() { }
+}
+
+// Add default
+
+pub trait AddDefaultTrait {
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl AddDefaultTrait for Foo {
+    fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl AddDefaultTrait for Foo {
+    default fn method_name() { }
+}
+
+// Remove default
+
+pub trait RemoveDefaultTrait {
+    fn method_name();
+}
+
+#[cfg(cfail1)]
+impl RemoveDefaultTrait for Foo {
+    default fn method_name() { }
+}
+
+#[cfg(not(cfail1))]
+#[rustc_dirty(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl RemoveDefaultTrait for Foo {
+    fn method_name() { }
+}
+
+// Add arguments
+
+#[cfg(cfail1)]
+pub trait AddArgumentTrait {
+    fn method_name(&self);
+}
+
+#[cfg(cfail1)]
+impl AddArgumentTrait for Foo {
+    fn method_name(&self) { }
+}
+
+#[cfg(not(cfail1))]
+pub trait AddArgumentTrait {
+    fn method_name(&self, x: u32);
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl AddArgumentTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name(&self, _x: u32) { }
+}
+
+// Change argument type
+
+#[cfg(cfail1)]
+pub trait ChangeArgumentTypeTrait {
+    fn method_name(&self, x: u32);
+}
+
+#[cfg(cfail1)]
+impl ChangeArgumentTypeTrait for Foo {
+    fn method_name(&self, _x: u32) { }
+}
+
+#[cfg(not(cfail1))]
+pub trait ChangeArgumentTypeTrait {
+    fn method_name(&self, x: char);
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_metadata_dirty(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+impl ChangeArgumentTypeTrait for Foo {
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    fn method_name(&self, _x: char) { }
+}
+