Added where_clause to other missing places

Author: farcaller

macro/platformtree.rs

@@ -109,6 +109,10 @@ fn macro_zinc_task(cx: &mut ExtCtxt, _: Span, _: Gc<ast::MetaItem>,
       let new_generics = ast::Generics {
         lifetimes: vec!(),
         ty_params: OwnedSlice::from_vec(params),
+        where_clause: ast::WhereClause {
+          id: ast::DUMMY_NODE_ID,
+          predicates: vec!(),
+        }
       };
       let new_node = ast::ItemFn(new_decl, style, abi, new_generics, block);
 

platformtree/builder/os.rs

@@ -174,6 +174,10 @@ fn build_args(builder: &mut Builder, cx: &mut ExtCtxt,
     }, ast::Generics {
       lifetimes: vec!(cx.lifetime_def(DUMMY_SP, intern("'a"), vec!())),
       ty_params: OwnedSlice::from_vec(collected_params),
+      where_clause: ast::WhereClause {
+        id: ast::DUMMY_NODE_ID,
+        predicates: vec!(),
+      }
     }),
     vis: ast::Public,
     span: DUMMY_SP,