diff --git a/src/test/incremental/hashes/let_expressions.rs b/src/test/incremental/hashes/let_expressions.rs
new file mode 100644
index 0000000000000000000000000000000000000000..7bfd8077a3da6abb117cc70edc8229724ecaa8ce
--- /dev/null
+++ b/src/test/incremental/hashes/let_expressions.rs
@@ -0,0 +1,228 @@
+// 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)]
+#![crate_type="rlib"]
+
+// Change Name -----------------------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_name() {
+    let _x = 2u64;
+}
+
+#[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 fn change_name() {
+    let _y = 2u64;
+}
+
+
+
+// Add Type --------------------------------------------------------------------
+#[cfg(cfail1)]
+pub fn add_type() {
+    let _x = 2u32;
+}
+
+#[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 fn add_type() {
+    let _x: u32 = 2u32;
+}
+
+
+
+// Change Type -----------------------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_type() {
+    let _x: u64 = 2;
+}
+
+#[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 fn change_type() {
+    let _x: u8 = 2;
+}
+
+
+
+// Change Mutability of Reference Type -----------------------------------------
+#[cfg(cfail1)]
+pub fn change_mutability_of_reference_type() {
+    let _x: &u64;
+}
+
+#[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 fn change_mutability_of_reference_type() {
+    let _x: &mut u64;
+}
+
+
+
+// Change Mutability of Slot ---------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_mutability_of_slot() {
+    let mut _x: u64 = 0;
+}
+
+#[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 fn change_mutability_of_slot() {
+    let _x: u64 = 0;
+}
+
+
+
+// Change Simple Binding to Pattern --------------------------------------------
+#[cfg(cfail1)]
+pub fn change_simple_binding_to_pattern() {
+    let _x = (0u8, 'x');
+}
+
+#[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 fn change_simple_binding_to_pattern() {
+    let (_a, _b) = (0u8, 'x');
+}
+
+
+
+// Change Name in Pattern ------------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_name_in_pattern() {
+    let (_a, _b) = (1u8, 'y');
+}
+
+#[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 fn change_name_in_pattern() {
+    let (_a, _c) = (1u8, 'y');
+}
+
+
+
+// Add `ref` in Pattern --------------------------------------------------------
+#[cfg(cfail1)]
+pub fn add_ref_in_pattern() {
+    let (_a, _b) = (1u8, 'y');
+}
+
+#[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 fn add_ref_in_pattern() {
+    let (ref _a, _b) = (1u8, 'y');
+}
+
+
+
+// Add `&` in Pattern ----------------------------------------------------------
+#[cfg(cfail1)]
+pub fn add_amp_in_pattern() {
+    let (_a, _b) = (&1u8, 'y');
+}
+
+#[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 fn add_amp_in_pattern() {
+    let (&_a, _b) = (&1u8, 'y');
+}
+
+
+
+// Change Mutability of Binding in Pattern -------------------------------------
+#[cfg(cfail1)]
+pub fn change_mutability_of_binding_in_pattern() {
+    let (_a, _b) = (99u8, 'q');
+}
+
+#[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 fn change_mutability_of_binding_in_pattern() {
+    let (mut _a, _b) = (99u8, 'q');
+}
+
+
+
+// Add Initializer -------------------------------------------------------------
+#[cfg(cfail1)]
+pub fn add_initializer() {
+    let _x: i16;
+}
+
+#[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 fn add_initializer() {
+    let _x: i16 = 3i16;
+}
+
+
+
+// Change Initializer ----------------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_initializer() {
+    let _x = 4u16;
+}
+
+#[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 fn change_initializer() {
+    let _x = 5u16;
+}