Actually commit tests

Author: jroesch

src/libsyntax/ext/expand.rs

@@ -1580,7 +1580,7 @@ pub fn expand_type(t: P<ast::Ty>, fld: &mut MacroExpander) -> P<ast::Ty> {
                     &fld.cx.parse_sess.span_diagnostic,
                     "type_macros",
                     t.span,
-                    "type macros are experimental (see tracking issue: 27336)");
+                    "type macros are experimental (see issue: #27336)");
                 t
             }
         }

src/test/compile-fail/type-macros-fail.rs

@@ -0,0 +1,21 @@
+// Copyright 2015 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.
+
+macro_rules! Id {
+    { $T:tt } => $T
+}
+
+struct Foo<T> {
+    x: Id!(T)
+}
+
+fn main() {
+    let foo = Foo { x: i32 };
+}

src/test/run-pass/type-macros-hlist.rs

@@ -0,0 +1,86 @@
+// Copyright 2015 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.
+
+#![feature(type_macros)]
+
+use std::ops::*;
+
+#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
+struct Nil; // empty HList
+#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
+struct Cons<H, T: HList>(H, T); // cons cell of HList
+
+// trait to classify valid HLists
+trait HList {}
+impl HList for Nil {}
+impl<H, T: HList> HList for Cons<H, T> {}
+
+// term-level macro for HLists
+macro_rules! hlist {
+        {} => { Nil };
+        { $head:expr } => { Cons($head, Nil) };
+        { $head:expr, $($tail:expr),* } => { Cons($head, hlist!($($tail),*)) };
+}
+
+// type-level macro for HLists
+macro_rules! HList {
+        {} => { Nil };
+        { $head:ty } => { Cons<$head, Nil> };
+        { $head:ty, $($tail:ty),* } => { Cons<$head, HList!($($tail),*)> };
+}
+
+// nil case for HList append
+impl<Ys: HList> Add<Ys> for Nil {
+    type Output = Ys;
+
+    fn add(self, rhs: Ys) -> Ys {
+        rhs
+    }
+}
+
+// cons case for HList append
+impl<Rec: HList + Sized, X, Xs: HList, Ys: HList> Add<Ys> for Cons<X, Xs> where
+    Xs: Add<Ys, Output = Rec>,
+{
+    type Output = Cons<X, Rec>;
+
+    fn add(self, rhs: Ys) -> Cons<X, Rec> {
+        Cons(self.0, self.1 + rhs)
+    }
+}
+
+// type macro Expr allows us to expand the + operator appropriately
+macro_rules! Expr {
+        { ( $($LHS:tt)+ ) } => { Expr!($($LHS)+) };
+        { HList ! [ $($LHS:tt)* ] + $($RHS:tt)+ } => {
+            <Expr!(HList![$($LHS)*]) as Add<Expr!($($RHS)+)>>::Output
+        };
+        { $LHS:tt + $($RHS:tt)+ } => { <Expr!($LHS) as Add<Expr!($($RHS)+)>>::Output };
+        { $LHS:ty } => { $LHS };
+}
+
+// test demonstrating term level `xs + ys` and type level `Expr!(Xs + Ys)`
+fn main() {
+    fn aux<Xs: HList, Ys: HList>(xs: Xs, ys: Ys) -> Expr!(Xs + Ys)
+        where Xs: Add<Ys> {
+            xs + ys
+        }
+
+    let xs: HList![&str, bool, Vec<u64>] = hlist!["foo", false, vec![]];
+    let ys: HList![u64, [u8; 3], ()] = hlist![0, [0, 1, 2], ()];
+
+    // demonstrate recursive expansion of Expr!
+    let zs: Expr!((HList![&str] + HList![bool] + HList![Vec<u64>]) +
+                  (HList![u64] + HList![[u8; 3], ()]) +
+                  HList![])
+        = aux(xs, ys);
+    assert_eq!(zs, hlist!["foo", false, vec![], 0, [0, 1, 2], ()])
+}
+

src/test/run-pass/type-macros-simple.rs

@@ -0,0 +1,19 @@
+// Copyright 2015 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.
+
+#![feature(type_macros)]
+
+macro_rules! Tuple {
+    { $A:ty,$B:ty } => { ($A, $B) }
+}
+
+fn main() {
+    let x: Tuple!(i32, i32) = (1, 2);
+}