Add ICH test case for consts

Fixes #37000.

src/test/incremental/hashes/consts.rs

@@ -0,0 +1,132 @@
+// 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 consts.
+
+// 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 const visibility ---------------------------------------------------
+#[cfg(cfail1)]
+const CONST_VISIBILITY: u8 = 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 const CONST_VISIBILITY: u8 = 0;
+
+
+// Change type from i32 to u32 ------------------------------------------------
+#[cfg(cfail1)]
+const CONST_CHANGE_TYPE_1: i32 = 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")]
+const CONST_CHANGE_TYPE_1: u32 = 0;
+
+
+// Change type from Option<u32> to Option<u64> --------------------------------
+#[cfg(cfail1)]
+const CONST_CHANGE_TYPE_2: Option<u32> = None;
+
+#[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")]
+const CONST_CHANGE_TYPE_2: Option<u64> = None;
+
+
+// Change value between simple literals ---------------------------------------
+#[cfg(cfail1)]
+const CONST_CHANGE_VALUE_1: i16 = 1;
+
+#[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")]
+const CONST_CHANGE_VALUE_1: i16 = 2;
+
+
+// Change value between expressions -------------------------------------------
+#[cfg(cfail1)]
+const CONST_CHANGE_VALUE_2: i16 = 1 + 1;
+
+#[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")]
+const CONST_CHANGE_VALUE_2: i16 = 1 + 2;
+
+
+#[cfg(cfail1)]
+const CONST_CHANGE_VALUE_3: i16 = 2 + 3;
+
+#[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")]
+const CONST_CHANGE_VALUE_3: i16 = 2 * 3;
+
+
+#[cfg(cfail1)]
+const CONST_CHANGE_VALUE_4: i16 = 1 + 2 * 3;
+
+#[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")]
+const CONST_CHANGE_VALUE_4: i16 = 1 + 2 * 4;
+
+
+// Change type indirectly -----------------------------------------------------
+struct ReferencedType1;
+struct ReferencedType2;
+
+mod const_change_type_indirectly {
+    #[cfg(cfail1)]
+    use super::ReferencedType1 as Type;
+
+    #[cfg(not(cfail1))]
+    use super::ReferencedType2 as Type;
+
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    const CONST_CHANGE_TYPE_INDIRECTLY_1: Type = Type;
+
+    #[rustc_dirty(label="Hir", cfg="cfail2")]
+    #[rustc_clean(label="Hir", cfg="cfail3")]
+    #[rustc_metadata_dirty(cfg="cfail2")]
+    #[rustc_metadata_clean(cfg="cfail3")]
+    const CONST_CHANGE_TYPE_INDIRECTLY_2: Option<Type> = None;
+}