Auto merge of #48813 - sinkuu:build_in_assert_macro, r=alexcrichton

Make `assert` a built-in procedural macro

Makes `assert` macro a built-in one without touching its functionality. This is a prerequisite for RFC 2011 (#44838).

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index cd9484de85a..70a1f82c9a1 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -355,8 +355,9 @@ use prelude::v1::*;
 // We want to re-export a few macros from core but libcore has already been
 // imported by the compiler (via our #[no_std] attribute) In this case we just
 // add a new crate name so we can attach the re-exports to it.
-#[macro_reexport(assert, assert_eq, assert_ne, debug_assert, debug_assert_eq,
+#[macro_reexport(assert_eq, assert_ne, debug_assert, debug_assert_eq,
                  debug_assert_ne, unreachable, unimplemented, write, writeln, try)]
+#[cfg_attr(stage0, macro_reexport(assert))]
 extern crate core as __core;
 
 #[macro_use]