Added tests checking that changes in type sig are recognized in SVH.

(Only after adding the tests did I realize that this is not really a
special case at the AST level; as far as the visitor is concerned,
`int` and `i32` and `i64` are just idents.)

src/test/auxiliary/svh-a-change-type-arg.rs

@@ -0,0 +1,37 @@
+// Copyright 2014 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.
+
+//! The `svh-a-*.rs` files are all deviations from the base file
+//! svh-a-base.rs with some difference (usually in `fn foo`) that
+//! should not affect the strict version hash (SVH) computation
+//! (#14132).
+
+#![feature(macro_rules)]
+
+#![crate_id = "a"]
+
+macro_rules! three {
+    () => { 3 }
+}
+
+pub trait U {}
+pub trait V {}
+impl U for () {}
+impl V for () {}
+
+static A_CONSTANT : int = 2;
+
+pub fn foo<T:U>(_: i32) -> int {
+    3
+}
+
+pub fn an_unused_name() -> int {
+    4
+}

src/test/auxiliary/svh-a-change-type-ret.rs

@@ -0,0 +1,37 @@
+// Copyright 2014 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.
+
+//! The `svh-a-*.rs` files are all deviations from the base file
+//! svh-a-base.rs with some difference (usually in `fn foo`) that
+//! should not affect the strict version hash (SVH) computation
+//! (#14132).
+
+#![feature(macro_rules)]
+
+#![crate_id = "a"]
+
+macro_rules! three {
+    () => { 3 }
+}
+
+pub trait U {}
+pub trait V {}
+impl U for () {}
+impl V for () {}
+
+static A_CONSTANT : int = 2;
+
+pub fn foo<T:U>(_: int) -> i64 {
+    3
+}
+
+pub fn an_unused_name() -> i32 {
+    4
+}

src/test/auxiliary/svh-a-change-type-static.rs

@@ -0,0 +1,37 @@
+// Copyright 2014 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.
+
+//! The `svh-a-*.rs` files are all deviations from the base file
+//! svh-a-base.rs with some difference (usually in `fn foo`) that
+//! should not affect the strict version hash (SVH) computation
+//! (#14132).
+
+#![feature(macro_rules)]
+
+#![crate_id = "a"]
+
+macro_rules! three {
+    () => { 3 }
+}
+
+pub trait U {}
+pub trait V {}
+impl U for () {}
+impl V for () {}
+
+static A_CONSTANT : i32 = 2;
+
+pub fn foo<T:U>(_: int) -> int {
+    3
+}
+
+pub fn an_unused_name() -> int {
+    4
+}

src/test/compile-fail/svh-change-type-arg.rs

@@ -0,0 +1,24 @@
+// Copyright 2014 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.
+
+// note that these aux-build directives must be in this order
+// aux-build:svh-a-base.rs
+// aux-build:svh-b.rs
+// aux-build:svh-a-change-type-arg.rs
+
+#![feature(macro_rules)]
+
+extern crate a;
+extern crate b; //~ ERROR: found possibly newer version of crate `a` which `b` depends on
+//~^ NOTE: perhaps this crate needs to be recompiled
+
+fn main() {
+    b::foo()
+}

src/test/compile-fail/svh-change-type-ret.rs

@@ -0,0 +1,24 @@
+// Copyright 2014 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.
+
+// note that these aux-build directives must be in this order
+// aux-build:svh-a-base.rs
+// aux-build:svh-b.rs
+// aux-build:svh-a-change-type-ret.rs
+
+#![feature(macro_rules)]
+
+extern crate a;
+extern crate b; //~ ERROR: found possibly newer version of crate `a` which `b` depends on
+//~^ NOTE: perhaps this crate needs to be recompiled
+
+fn main() {
+    b::foo()
+}

src/test/compile-fail/svh-change-type-static.rs

@@ -0,0 +1,24 @@
+// Copyright 2014 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.
+
+// note that these aux-build directives must be in this order
+// aux-build:svh-a-base.rs
+// aux-build:svh-b.rs
+// aux-build:svh-a-change-type-static.rs
+
+#![feature(macro_rules)]
+
+extern crate a;
+extern crate b; //~ ERROR: found possibly newer version of crate `a` which `b` depends on
+//~^ NOTE: perhaps this crate needs to be recompiled
+
+fn main() {
+    b::foo()
+}