Add RUST_BACKTRACE

ci/test-cuda.sh

@@ -16,6 +16,7 @@ fi
 
 # shellcheck disable=SC1090    # <-- shellcheck can't follow ~
 source ~/.cargo/env
+export RUST_BACKTRACE=1
 cargo test --features=cuda
 
 exit 0

ci/test-nightly.sh

@@ -5,6 +5,7 @@ cd "$(dirname "$0")/.."
 rustc --version
 cargo --version
 
+export RUST_BACKTRACE=1
 rustup component add rustfmt-preview
 cargo build --verbose --features unstable
 cargo test --verbose --features unstable

ci/test-stable.sh

@@ -5,6 +5,7 @@ cd "$(dirname "$0")/.."
 rustc --version
 cargo --version
 
+export RUST_BACKTRACE=1
 rustup component add rustfmt-preview
 cargo fmt -- --write-mode=diff
 cargo build --verbose