Rollup merge of rust-lang#37694 - michaelwoerister:test-if-ich, r=brson

ICH: Add test case for if- and if-let-expressions.

r? @nikomatsakis

Author: eddyb

src/test/incremental/hashes/if_expressions.rs

@@ -0,0 +1,232 @@
+// 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 if 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 condition (if) -------------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_condition(x: bool) -> u32 {
+    if x {
+        return 1
+    }
+
+    return 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_condition(x: bool) -> u32 {
+    if !x {
+        return 1
+    }
+
+    return 0
+}
+
+// Change then branch (if) -----------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_then_branch(x: bool) -> u32 {
+    if x {
+        return 1
+    }
+
+    return 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_then_branch(x: bool) -> u32 {
+    if x {
+        return 2
+    }
+
+    return 0
+}
+
+
+
+// Change else branch (if) -----------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_else_branch(x: bool) -> u32 {
+    if x {
+        1
+    } else {
+        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_else_branch(x: bool) -> u32 {
+    if x {
+        1
+    } else {
+        3
+    }
+}
+
+
+
+// Add else branch (if) --------------------------------------------------------
+#[cfg(cfail1)]
+pub fn add_else_branch(x: bool) -> u32 {
+    let mut ret = 1;
+
+    if x {
+        ret += 1;
+    }
+
+    ret
+}
+
+#[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_else_branch(x: bool) -> u32 {
+    let mut ret = 1;
+
+    if x {
+        ret += 1;
+    } else {
+    }
+
+    ret
+}
+
+
+
+// Change condition (if let) ---------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_condition_if_let(x: Option<u32>) -> u32 {
+    if let Some(_x) = x {
+        return 1
+    }
+
+    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_condition_if_let(x: Option<u32>) -> u32 {
+    if let Some(_) = x {
+        return 1
+    }
+
+    0
+}
+
+
+
+// Change then branch (if let) -------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_then_branch_if_let(x: Option<u32>) -> u32 {
+    if let Some(x) = x {
+        return x
+    }
+
+    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_then_branch_if_let(x: Option<u32>) -> u32 {
+    if let Some(x) = x {
+        return x + 1
+    }
+
+    0
+}
+
+
+
+// Change else branch (if let) -------------------------------------------------
+#[cfg(cfail1)]
+pub fn change_else_branch_if_let(x: Option<u32>) -> u32 {
+    if let Some(x) = x {
+        x
+    } else {
+        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")]
+pub fn change_else_branch_if_let(x: Option<u32>) -> u32 {
+    if let Some(x) = x {
+        x
+    } else {
+        2
+    }
+}
+
+
+
+// Add else branch (if let) ----------------------------------------------------
+#[cfg(cfail1)]
+pub fn add_else_branch_if_let(x: Option<u32>) -> u32 {
+    let mut ret = 1;
+
+    if let Some(x) = x {
+        ret += x;
+    }
+
+    ret
+}
+
+#[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_else_branch_if_let(x: Option<u32>) -> u32 {
+    let mut ret = 1;
+
+    if let Some(x) = x {
+        ret += x;
+    } else {
+    }
+
+    ret
+}