remove needs_drop impl

.travis.yml

@@ -38,7 +38,10 @@ script:
   xargo/build.sh &&
   export MIRI_SYSROOT=~/.xargo/HOST
 - |
-  # Test `cargo miri`
+  # run all tests with full mir
+  cargo test --release --all-features
+- |
+  # test `cargo miri`
   cd cargo-miri-test &&
   if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
     cargo miri -q -- -Zmiri-start-fn
@@ -50,12 +53,9 @@ script:
     diff -u stdout.ref stdout.real &&
     diff -u stderr.ref stderr.real
   fi &&
-  # Test `cargo miri test`
+  # test `cargo miri test`
   cargo miri test &&
   cd ..
-- |
-  # and run all tests with full mir
-  cargo test --release --all-features
 
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rust-toolchain

@@ -1 +1 @@
-nightly-2018-09-29
+nightly-2018-10-01

src/intrinsic.rs

@@ -272,16 +272,6 @@ impl<'a, 'mir, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'mir, 'tcx, super:
                 self.copy_op(args[1], ptr.into())?;
             }
 
-            "needs_drop" => {
-                let ty = substs.type_at(0);
-                let env = ty::ParamEnv::reveal_all();
-                let needs_drop = ty.needs_drop(self.tcx.tcx, env);
-                self.write_scalar(
-                    Scalar::from_bool(needs_drop),
-                    dest,
-                )?;
-            }
-
             "offset" => {
                 let offset = self.read_scalar(args[1])?.to_isize(&self)?;
                 let ptr = self.read_scalar(args[0])?.not_undef()?;