libtest: deny warnings in doctests

Author: Ryman

mk/tests.mk

@@ -26,7 +26,7 @@ TEST_TARGET_CRATES = $(filter-out core rustc_unicode alloc_system \
 		     		  alloc_jemalloc,$(TARGET_CRATES)) \
 			collectionstest coretest
 TEST_DOC_CRATES = $(DOC_CRATES) arena flate fmt_macros getopts graphviz \
-                log rand rbml serialize syntax term
+                log rand rbml serialize syntax term test
 TEST_HOST_CRATES = $(filter-out rustc_typeck rustc_borrowck rustc_resolve \
 		   		rustc_trans rustc_lint,\
                      $(HOST_CRATES))

src/libtest/lib.rs

@@ -32,7 +32,8 @@
 #![crate_type = "dylib"]
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
-       html_root_url = "https://doc.rust-lang.org/nightly/")]
+       html_root_url = "https://doc.rust-lang.org/nightly/",
+       test(attr(deny(warnings))))]
 
 #![feature(asm)]
 #![feature(box_syntax)]