Revise test slightly so that dyn in macro invocation *must* be parsed as keyword in test.

Back-story: After reflection this morning, I realized that the
previous form of this test would allow the macro invocation to treat
the `dyn` input as a raw-identifier rather than a keyword, and since
the input was discarded by that version of the macro, the test would
pass despite the detail that the input `dyn` should not have been
parsed as a raw-identifier.

This revision fixes that oversight, by actually *using* the macro
input to construct a `Box<dyn Trait>` type.

Author: pnkfelix

src/test/ui/dyn-keyword/dyn-2015-edition-keyword-ident-lint.fixed

@@ -45,7 +45,7 @@ mod macro_defn {
 //~| WARN was previously accepted
 
         // Note that we do not lint nor fix occurrences under macros
-        ($dyn:ident) => { Box<dyn Trait> }
+        ($dyn:tt) => { (Box<dyn Trait>, Box<$dyn Trait>) }
     }
 
     pub fn r#dyn() -> ::outer_mod::r#dyn::r#dyn {
@@ -72,7 +72,7 @@ mod macro_defn {
             dyn
     )
     {
-        Box::new(10)
+        (Box::new(1), Box::new(2))
     }
 }
 

src/test/ui/dyn-keyword/dyn-2015-edition-keyword-ident-lint.rs

@@ -45,7 +45,7 @@ mod macro_defn {
 //~| WARN was previously accepted
 
         // Note that we do not lint nor fix occurrences under macros
-        ($dyn:ident) => { Box<dyn Trait> }
+        ($dyn:tt) => { (Box<dyn Trait>, Box<$dyn Trait>) }
     }
 
     pub fn dyn() -> ::outer_mod::dyn::dyn {
@@ -72,7 +72,7 @@ mod macro_defn {
             dyn
     )
     {
-        Box::new(10)
+        (Box::new(1), Box::new(2))
     }
 }