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Change DST syntax: type -> Sized?

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closes #13367

[breaking-change] Use `Sized?` to indicate a dynamically sized type parameter or trait (used to be `type`). E.g.,

```
trait Tr for Sized? {}

fn foo<Sized? X: Share>(x: X) {}
```
This commit is contained in:
Nick Cameron
2014-07-08 14:26:02 +12:00
parent 6959931498
commit a0cfda53c4
29 changed files with 215 additions and 178 deletions
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21
src/libsyntax/print/pprust.rs
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@@ -740,14 +740,19 @@ impl<'a> State<'a> {
}
try!(self.bclose(item.span));
}
ast::ItemTrait(ref generics, ref sized, ref traits, ref methods) => {
ast::ItemTrait(ref generics, ref unbound, ref traits, ref methods) => {
try!(self.head(visibility_qualified(item.vis,
"trait").as_slice()));
try!(self.print_ident(item.ident));
try!(self.print_generics(generics));
if *sized == ast::DynSize {
try!(space(&mut self.s));
try!(word(&mut self.s, "for type"));
match unbound {
&Some(TraitTyParamBound(ref tref)) => {
try!(space(&mut self.s));
try!(self.word_space("for"));
try!(self.print_trait_ref(tref));
try!(word(&mut self.s, "?"));
}
_ => {}
}
if traits.len() != 0u {
try!(word(&mut self.s, ":"));
@@ -2029,8 +2034,12 @@ impl<'a> State<'a> {
} else {
let idx = idx - generics.lifetimes.len();
let param = generics.ty_params.get(idx);
if param.sized == ast::DynSize {
try!(s.word_space("type"));
match param.unbound {
Some(TraitTyParamBound(ref tref)) => {
try!(s.print_trait_ref(tref));
try!(s.word_space("?"));
}
_ => {}
}
try!(s.print_ident(param.ident));
try!(s.print_bounds(&None,