Added support for compiler tests

Author: fuine

.travis.yml

@@ -15,6 +15,8 @@ script:
   travis-cargo --only nightly build -- --features spin_no_std &&
   travis-cargo --only nightly test -- --features spin_no_std &&
   travis-cargo --only nightly bench -- --features spin_no_std &&
+  travis-cargo --only nightly build -- --features compiletest &&
+  travis-cargo --only nightly test -- --features compiletest &&
   travis-cargo --only stable doc
 after_success:
 - travis-cargo --only stable doc-upload

Cargo.toml

@@ -17,9 +17,14 @@ categories = [ "no-std", "rust-patterns" ]
 version = "0.4"
 optional = true
 
+[dependencies.compiletest_rs]
+version = "0.3"
+optional = true
+
 [features]
 nightly = []
 spin_no_std = ["nightly", "spin"]
+compiletest = ["compiletest_rs"]
 
 [badges]
 appveyor = { repository = "rust-lang-nursery/lazy-static.rs" }

tests/compile-fail/static_never_used.rs

@@ -0,0 +1,10 @@
+// error-pattern:static item is never used: `UNUSED`
+#![deny(dead_code)]
+#[macro_use]
+extern crate lazy_static;
+
+lazy_static! {
+    static ref UNUSED: () = ();
+}
+
+fn main() { }

tests/compile_tests.rs

@@ -0,0 +1,18 @@
+#![cfg(feature="compiletest")]
+extern crate compiletest_rs as compiletest;
+
+use std::path::PathBuf;
+
+fn run_mode(mode: &'static str) {
+    let mut config = compiletest::Config::default();
+    config.mode = mode.parse().expect("Invalid mode");
+    config.src_base = PathBuf::from(format!("tests/{}", mode));
+    config.target_rustcflags = Some("-L target/debug".to_string());
+
+    compiletest::run_tests(&config);
+}
+
+#[test]
+fn compile_test() {
+    run_mode("compile-fail");
+}

tests/test.rs

@@ -27,10 +27,6 @@ lazy_static! {
     static ref UNSAFE: u32 = unsafe {
         std::mem::transmute::<i32, u32>(-1)
     };
-
-    // This *should* triggger warn(dead_code) by design.
-    static ref UNUSED: () = ();
-
 }
 
 lazy_static! {