test: Test the lexer now that #15879 is closed

Author: richo

src/test/run-pass/issue-4759-1.rs

@@ -7,8 +7,6 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-//
-// ignore-lexer-test FIXME #15877
 
 trait U { fn f(self); }
 impl U for int { fn f(self) {} }

src/test/run-pass/unsized.rs

@@ -7,8 +7,6 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-//
-// ignore-lexer-test FIXME #15879
 
 // Test syntax checks for `?Sized` syntax.
 

src/test/run-pass/unsized2.rs

@@ -7,8 +7,6 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-//
-// ignore-lexer-test FIXME #15879
 
 #![allow(unknown_features)]
 #![feature(box_syntax)]