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Add syntax for negative implementations of traits

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This commit introduces the syntax for negative implmenetations of traits
as shown below:

`impl !Trait for Type {}`

cc #13231
Part of RFC #3
This commit is contained in:
Flavio Percoco
2014-12-28 23:33:18 +01:00
parent 470118f3e9
commit 8b883ab268
34 changed files with 176 additions and 39 deletions
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5
src/libsyntax/fold.rs
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@@ -1014,7 +1014,7 @@ pub fn noop_fold_item_underscore<T: Folder>(i: Item_, folder: &mut T) -> Item_ {
let struct_def = folder.fold_struct_def(struct_def);
ItemStruct(struct_def, folder.fold_generics(generics))
}
ItemImpl(unsafety, generics, ifce, ty, impl_items) => {
ItemImpl(unsafety, polarity, generics, ifce, ty, impl_items) => {
let mut new_impl_items = Vec::new();
for impl_item in impl_items.iter() {
match *impl_item {
@@ -1037,6 +1037,7 @@ pub fn noop_fold_item_underscore<T: Folder>(i: Item_, folder: &mut T) -> Item_ {
}
};
ItemImpl(unsafety,
polarity,
folder.fold_generics(generics),
ifce,
folder.fold_ty(ty),
@@ -1166,7 +1167,7 @@ pub fn noop_fold_item_simple<T: Folder>(Item {id, ident, attrs, node, vis, span}
let node = folder.fold_item_underscore(node);
let ident = match node {
// The node may have changed, recompute the "pretty" impl name.
ItemImpl(_, _, ref maybe_trait, ref ty, _) => {
ItemImpl(_, _, _, ref maybe_trait, ref ty, _) => {
ast_util::impl_pretty_name(maybe_trait, &**ty)
}
_ => ident