enable rustc lints

(but not in cargo-miri and ui_test)

Author: RalfJung

cargo-miri/src/main.rs

@@ -1,5 +1,5 @@
 #![feature(let_else)]
-#![allow(clippy::useless_format, clippy::derive_partial_eq_without_eq)]
+#![allow(clippy::useless_format, clippy::derive_partial_eq_without_eq, rustc::internal)]
 
 mod arg;
 mod phases;

miri

@@ -124,6 +124,8 @@ fi
 if [ -z "$CARGO_PROFILE_DEV_OPT_LEVEL" ]; then
     export CARGO_PROFILE_DEV_OPT_LEVEL=2
 fi
+# Enable rustc-specific lints
+export RUSTFLAGS="-Zunstable-options -Wrustc::internal $RUSTFLAGS"
 # We set the rpath so that Miri finds the private rustc libraries it needs.
 export RUSTFLAGS="-C link-args=-Wl,-rpath,$LIBDIR $RUSTFLAGS"
 

ui_test/src/lib.rs

@@ -1,4 +1,9 @@
-#![allow(clippy::enum_variant_names, clippy::useless_format, clippy::too_many_arguments)]
+#![allow(
+    clippy::enum_variant_names,
+    clippy::useless_format,
+    clippy::too_many_arguments,
+    rustc::internal
+)]
 
 use std::collections::VecDeque;
 use std::ffi::OsString;