build: avoid timing out in Travis

Author: tesuji

ci/integration-tests.sh

@@ -18,6 +18,8 @@ cd checkout
 
 # run clippy on a project, try to be verbose and trigger as many warnings
 # as possible for greater coverage
+# NOTE: we use `tee` to print any warnings and errors to stdout
+#       to avoid build timeout in Travis
 RUST_BACKTRACE=full \
 cargo clippy \
     --all-targets \
@@ -26,10 +28,9 @@ cargo clippy \
     --cap-lints warn \
     -W clippy::pedantic \
     -W clippy::nursery \
-    > clippy_output 2>&1 || true
+    2>&1 | tee clippy_output
 
 cargo uninstall clippy
-cat clippy_output
 
 if grep -q "internal compiler error\|query stack during panic\|E0463" clippy_output; then
     exit 1