rollup merge of #24487: erickt/syntax

This removes the usage of `#[feature(into_cow, slice_patterns, box_syntax, box_patterns, quote, unsafe_destructor)]` from being used in libsyntax. My main desire for this is that it brings me one step closer to letting [syntex](https://github.com/erickt/rust-syntex) compile with stable rust. Hopefully this doesn't inconvenience rust development.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index 55afac1a1de..50ab430f148 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -262,10 +262,10 @@ macro_rules! make_MacEager {
         impl MacEager {
             $(
                 pub fn $fld(v: $t) -> Box<MacResult> {
-                    box MacEager {
+                    Box::new(MacEager {
                         $fld: Some(v),
                         ..Default::default()
-                    }
+                    })
                 }
             )*
         }
@@ -331,7 +331,7 @@ impl DummyResult {
     /// Use this as a return value after hitting any errors and
     /// calling `span_err`.
     pub fn any(sp: Span) -> Box<MacResult+'static> {
-        box DummyResult { expr_only: false, span: sp }
+        Box::new(DummyResult { expr_only: false, span: sp })
     }
 
     /// Create a default MacResult that can only be an expression.
@@ -340,7 +340,7 @@ impl DummyResult {
     /// if an error is encountered internally, the user will receive
     /// an error that they also used it in the wrong place.
     pub fn expr(sp: Span) -> Box<MacResult+'static> {
-        box DummyResult { expr_only: true, span: sp }
+        Box::new(DummyResult { expr_only: true, span: sp })
     }
 
     /// A plain dummy expression.