Switched to Box::new in many places.

Many of the modifications putting in `Box::new` calls also include a
pointer to Issue 22405, which tracks going back to `box <expr>` if
possible in the future.

(Still tried to use `Box<_>` where it sufficed; thus some tests still
have `box_syntax` enabled, as they use a mix of `box` and `Box::new`.)

Precursor for overloaded-`box` and placement-`in`; see Issue 22181.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/libsyntax/ext/tt/macro_parser.rs b/src/libsyntax/ext/tt/macro_parser.rs
index ce513bc91f5..0ac78209b6f 100644
--- a/src/libsyntax/ext/tt/macro_parser.rs
+++ b/src/libsyntax/ext/tt/macro_parser.rs
@@ -479,7 +479,7 @@ pub fn parse(sess: &ParseSess,
                 }
                 rdr.next_token();
             } else /* bb_eis.len() == 1 */ {
-                let mut rust_parser = Parser::new(sess, cfg.clone(), box rdr.clone());
+                let mut rust_parser = Parser::new(sess, cfg.clone(), Box::new(rdr.clone()));
 
                 let mut ei = bb_eis.pop().unwrap();
                 match ei.top_elts.get_tt(ei.idx) {
diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index 67011ad21a6..db7db4b83ac 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -180,7 +180,7 @@ fn generic_extension<'cx>(cx: &'cx ExtCtxt,
                                            Some(named_matches),
                                            imported_from,
                                            rhs);
-                let mut p = Parser::new(cx.parse_sess(), cx.cfg(), box trncbr);
+                let mut p = Parser::new(cx.parse_sess(), cx.cfg(), Box::new(trncbr));
                 p.check_unknown_macro_variable();
                 // Let the context choose how to interpret the result.
                 // Weird, but useful for X-macros.
@@ -267,7 +267,7 @@ pub fn compile<'cx>(cx: &'cx mut ExtCtxt,
         _ => cx.span_bug(def.span, "wrong-structured rhs")
     };
 
-    let exp = box MacroRulesMacroExpander {
+    let exp: Box<_> = box MacroRulesMacroExpander {
         name: def.ident,
         imported_from: def.imported_from,
         lhses: lhses,