CI: run tests in Miri

.travis.yml

@@ -8,3 +8,10 @@ env:
 script:
   - cargo test --verbose --features 'less-slow-kanji-encode less-slow-big5-hanzi-encode less-slow-gb-hanzi-encode serde'
   - cargo test --verbose
+
+matrix:
+  include:
+  - name: miri
+    rust: nightly
+    script:
+      - sh ci/miri.sh

ci/miri.sh

@@ -0,0 +1,14 @@
+set -ex
+
+# Install Miri.
+MIRI_NIGHTLY=nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)
+echo "Installing latest nightly with Miri: $MIRI_NIGHTLY"
+rustup default "$MIRI_NIGHTLY"
+rustup component add miri
+
+# Run tests.
+# Stacked Borrows is disabled as it costs too much RAM (due to our large tables).
+cargo miri test -- -Zmiri-disable-stacked-borrows
+
+# Restore old state in case Travis uses this cache for other jobs.
+rustup default nightly