Try #225:

Author: bors[bot]

.travis.yml

@@ -8,27 +8,26 @@ branches:
     - master
 language: rust
 os: linux
-dist: xenial
+dist: focal
 addons:
   apt:
+    sources:
+    - sourceline: "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main"
+      key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
     packages:
-    - llvm-3.8-dev
-    - libclang-3.8-dev
-    - clang-3.8
+    - clang-11
     - cmake
 rust:
-   - stable
-   - beta
+   - nightly-2021-03-25
    - nightly
-   - nightly-2019-07-01
-   - nightly-2019-10-28
+   - beta
+   - stable
 env:
   global:
     - RUST_BACKTRACE=1
     # Pinned to this particular nightly version because of core_io. This can be
     # re-pinned whenever core_io is updated to the latest nightly.
-    - CORE_IO_NIGHTLY=nightly-2019-07-01
-    - SGX_NIGHTLY=nightly-2019-10-28
-    - LLVM_CONFIG_PATH=llvm-config-3.8
+    - CORE_IO_NIGHTLY=nightly-2021-03-25
+    - SGX_NIGHTLY=nightly-2021-03-25
 script:
   - ./ct.sh