Auto merge of #4245 - flip1995:ice_4121, r=matthiaskrgr

Test for melted ICE #4121

resolves #4121

r? @matthiaskrgr

changelog: none

.travis.yml

@@ -51,13 +51,12 @@ matrix:
     # We don't want to run these always because they go towards
     # the build limit within the Travis rust-lang account.
     # The jobs are approximately sorted by execution time
-    # disabled cargo and rls integration test due to https://github.com/rust-lang/rust-clippy/issues/4121
-    #- env: INTEGRATION=rust-lang/cargo
-    #  if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
+    - env: INTEGRATION=rust-lang/cargo
+      if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=rust-lang-nursery/chalk
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
-    #- env: INTEGRATION=rust-lang/rls
-    #  if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
+    - env: INTEGRATION=rust-lang/rls
+      if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=Geal/nom
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=rust-lang/rustfmt

tests/ui/ice-4121.rs

@@ -0,0 +1,13 @@
+use std::mem;
+
+pub struct Foo<A, B>(A, B);
+
+impl<A, B> Foo<A, B> {
+    const HOST_SIZE: usize = mem::size_of::<B>();
+
+    pub fn crash() -> bool {
+        Self::HOST_SIZE == 0
+    }
+}
+
+fn main() {}