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Implement existential types

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This commit is contained in:
Oliver Schneider
2018-07-03 19:38:14 +02:00
parent 1c84d81873
commit 53d2ebb0ad
182 changed files with 1389 additions and 121 deletions
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24
src/libsyntax/print/pprust.rs
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@@ -1280,9 +1280,7 @@ impl<'a> State<'a> {
self.end()?;
}
ast::ItemKind::Ty(ref ty, ref generics) => {
self.ibox(INDENT_UNIT)?;
self.ibox(0)?;
self.word_nbsp(&visibility_qualified(&item.vis, "type"))?;
self.head(&visibility_qualified(&item.vis, "type"))?;
self.print_ident(item.ident)?;
self.print_generic_params(&generics.params)?;
self.end()?; // end the inner ibox
@@ -1294,6 +1292,18 @@ impl<'a> State<'a> {
self.s.word(";")?;
self.end()?; // end the outer ibox
}
ast::ItemKind::Existential(ref bounds, ref generics) => {
self.head(&visibility_qualified(&item.vis, "existential type"))?;
self.print_ident(item.ident)?;
self.print_generic_params(&generics.params)?;
self.end()?; // end the inner ibox
self.print_where_clause(&generics.where_clause)?;
self.s.space()?;
self.print_type_bounds(":", bounds)?;
self.s.word(";")?;
self.end()?; // end the outer ibox
}
ast::ItemKind::Enum(ref enum_definition, ref params) => {
self.print_enum_def(
enum_definition,
@@ -1501,8 +1511,8 @@ impl<'a> State<'a> {
}
}
pub fn print_defaultness(&mut self, defatulness: ast::Defaultness) -> io::Result<()> {
if let ast::Defaultness::Default = defatulness {
pub fn print_defaultness(&mut self, defaultness: ast::Defaultness) -> io::Result<()> {
if let ast::Defaultness::Default = defaultness {
try!(self.word_nbsp("default"));
}
Ok(())
@@ -1650,6 +1660,10 @@ impl<'a> State<'a> {
ast::ImplItemKind::Type(ref ty) => {
self.print_associated_type(ii.ident, None, Some(ty))?;
}
ast::ImplItemKind::Existential(ref bounds) => {
self.word_space("existential")?;
self.print_associated_type(ii.ident, Some(bounds), None)?;
}
ast::ImplItemKind::Macro(ref mac) => {
self.print_mac(mac)?;
match mac.node.delim {