syntax: implement #[deriving(DeepClone)]. Fixes #6514.

doc/rust.md

@@ -1562,7 +1562,7 @@ Supported traits for `deriving` are:
 
 * Comparison traits: `Eq`, `TotalEq`, `Ord`, `TotalOrd`.
 * Serialization: `Encodable`, `Decodable`. These require `std`.
-* `Clone`, to perform deep copies.
+* `Clone` and `DeepClone`, to perform (deep) copies.
 * `IterBytes`, to iterate over the bytes in a data type.
 * `Rand`, to create a random instance of a data type.
 * `ToStr`, to convert to a string. For a type with this instance,

doc/tutorial.md

@@ -2308,8 +2308,8 @@ enum ABC { A, B, C }
 ~~~
 
 The full list of derivable traits is `Eq`, `TotalEq`, `Ord`,
-`TotalOrd`, `Encodable` `Decodable`, `Clone`, `IterBytes`, `Rand` and
-`ToStr`.
+`TotalOrd`, `Encodable` `Decodable`, `Clone`, `DeepClone`,
+`IterBytes`, `Rand` and `ToStr`.
 
 # Modules and crates
 

src/libsyntax/ext/deriving/clone.rs

@@ -32,7 +32,7 @@ pub fn expand_deriving_clone(cx: @ext_ctxt,
                 args: ~[],
                 ret_ty: Self,
                 const_nonmatching: false,
-                combine_substructure: cs_clone
+                combine_substructure: |c, s, sub| cs_clone("Clone", c, s, sub)
             }
         ]
     };
@@ -42,8 +42,39 @@ pub fn expand_deriving_clone(cx: @ext_ctxt,
                             &trait_def)
 }
 
-fn cs_clone(cx: @ext_ctxt, span: span,
-            substr: &Substructure) -> @expr {
+pub fn expand_deriving_deep_clone(cx: @ext_ctxt,
+                                 span: span,
+                                 mitem: @meta_item,
+                                 in_items: ~[@item])
+    -> ~[@item] {
+    let trait_def = TraitDef {
+        path: Path::new(~[~"core", ~"clone", ~"DeepClone"]),
+        additional_bounds: ~[],
+        generics: LifetimeBounds::empty(),
+        methods: ~[
+            MethodDef {
+                name: ~"deep_clone",
+                generics: LifetimeBounds::empty(),
+                explicit_self: borrowed_explicit_self(),
+                args: ~[],
+                ret_ty: Self,
+                const_nonmatching: false,
+                // cs_clone uses the ident passed to it, i.e. it will
+                // call deep_clone (not clone) here.
+                combine_substructure: |c, s, sub| cs_clone("DeepClone", c, s, sub)
+            }
+        ]
+    };
+
+    expand_deriving_generic(cx, span,
+                            mitem, in_items,
+                            &trait_def)
+}
+
+fn cs_clone(
+    name: &str,
+    cx: @ext_ctxt, span: span,
+    substr: &Substructure) -> @expr {
     let clone_ident = substr.method_ident;
     let ctor_ident;
     let all_fields;
@@ -59,8 +90,12 @@ fn cs_clone(cx: @ext_ctxt, span: span,
             ctor_ident = ~[ variant.node.name ];
             all_fields = af;
         },
-        EnumNonMatching(*) => cx.span_bug(span, "Non-matching enum variants in `deriving(Clone)`"),
-        StaticEnum(*) | StaticStruct(*) => cx.span_bug(span, "Static method in `deriving(Clone)`")
+        EnumNonMatching(*) => cx.span_bug(span,
+                                          fmt!("Non-matching enum variants in `deriving(%s)`",
+                                               name)),
+        StaticEnum(*) | StaticStruct(*) => cx.span_bug(span,
+                                                       fmt!("Static method in `deriving(%s)`",
+                                                            name))
     }
 
     match *all_fields {
@@ -75,8 +110,8 @@ fn cs_clone(cx: @ext_ctxt, span: span,
                 let ident = match o_id {
                     Some(i) => i,
                     None => cx.span_bug(span,
-                                        ~"unnamed field in normal struct \
-                                          in `deriving(Clone)`")
+                                        fmt!("unnamed field in normal struct in `deriving(%s)`",
+                                             name))
                 };
                 build::Field { ident: ident, ex: subcall(self_f) }
             };

src/libsyntax/ext/deriving/mod.rs

@@ -84,6 +84,7 @@ pub fn expand_meta_deriving(cx: @ext_ctxt,
                                                                    titem, in_items)));
                         match *tname {
                             ~"Clone" => expand!(clone::expand_deriving_clone),
+                            ~"DeepClone" => expand!(clone::expand_deriving_deep_clone),
 
                             ~"IterBytes" => expand!(iter_bytes::expand_deriving_iter_bytes),
 

src/test/run-pass/deriving-clone-enum.rs

@@ -8,11 +8,14 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#[deriving(Clone)]
+#[deriving(Clone, DeepClone)]
 enum E {
     A,
     B(()),
     C
 }
 
-pub fn main() {}
+pub fn main() {
+    let _ = A.clone();
+    let _ = B(()).deep_clone();
+}

src/test/run-pass/deriving-clone-generic-enum.rs

@@ -1,8 +1,21 @@
-#[deriving(Clone)]
+// Copyright 2013 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.
+
+#[deriving(Clone, DeepClone)]
 enum E<T,U> {
     A(T),
     B(T,U),
     C
 }
 
-fn main() {}
+fn main() {
+    let _ = A::<int, int>(1i).clone();
+    let _ = B(1i, 1.234).deep_clone();
+}

src/test/run-pass/deriving-clone-generic-struct.rs

@@ -8,11 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#[deriving(Clone)]
+#[deriving(Clone, DeepClone)]
 struct S<T> {
     foo: (),
     bar: (),
     baz: T,
 }
 
-pub fn main() {}
+pub fn main() {
+    let _ = S { foo: (), bar: (), baz: 1i }.clone().deep_clone();
+}

src/test/run-pass/deriving-clone-generic-tuple-struct.rs

@@ -1,4 +1,16 @@
-#[deriving(Clone)]
+// Copyright 2013 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.
+
+#[deriving(Clone, DeepClone)]
 struct S<T>(T, ());
 
-fn main() {}
+fn main() {
+    let _ = S(1i, ()).clone().deep_clone();
+}

src/test/run-pass/deriving-clone-struct.rs

@@ -1,4 +1,14 @@
-#[deriving(Clone)]
+// Copyright 2013 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.
+
+#[deriving(Clone, DeepClone)]
 struct S {
     _int: int,
     _i8: i8,