test: Add another test using multiple versions of the same crate

Author: brson

src/test/auxiliary/crateresolve5-1.rs

@@ -0,0 +1,10 @@
+#[link(name = "crateresolve5",
+       vers = "0.1")];
+
+#[crate_type = "lib"];
+
+fn structural() -> { name: str, val: int } {
+    { name: "crateresolve5", val: 10 }
+}
+
+fn f() -> int { 10 }

src/test/auxiliary/crateresolve5-2.rs

@@ -0,0 +1,10 @@
+#[link(name = "crateresolve5",
+       vers = "0.2")];
+
+#[crate_type = "lib"];
+
+fn structural() -> { name: str, val: int } {
+    { name: "crateresolve5", val: 10 }
+}
+
+fn f() -> int { 20 }

src/test/run-pass/crateresolve5.rs

@@ -0,0 +1,13 @@
+// xfail-fast
+// aux-build:crateresolve5-1.rs
+// aux-build:crateresolve5-2.rs
+
+use cr5_1 (name = "crateresolve5", vers = "0.1");
+use cr5_2 (name = "crateresolve5", vers = "0.2");
+
+fn main() {
+    // Structural types can be used between two versions of the same crate
+    assert cr5_1::structural() == cr5_2::structural();
+    // Make sure these are actually two different crates
+    assert cr5_1::f() == 10 && cr5_2::f() == 20;
+}