diff --git a/scripts/cargo-cache-build.sh b/scripts/cargo-cache-build.sh
index 8e49299a1..94bb3232f 100755
--- a/scripts/cargo-cache-build.sh
+++ b/scripts/cargo-cache-build.sh
@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# A setup failure under set -e otherwise dies with no output at all;
+# CI has eaten six silent exit-1s from this script in one day. Name
+# the dying command instead of leaving a bare exit code.
+trap 'echo "cargo-cache-build.sh: exit $? at line $LINENO: $BASH_COMMAND" >&2' ERR
+
 # Shared Cargo build wrapper.
 # Keeps Rust/C/C++ artifacts in stable cache locations and opportunistically
 # enables compiler caches so whole-workspace builds warm up instead of starting
diff --git a/scripts/tests/cargo-cache-build-tests.sh b/scripts/tests/cargo-cache-build-tests.sh
index 6f123fb05..a07c8d71d 100755
--- a/scripts/tests/cargo-cache-build-tests.sh
+++ b/scripts/tests/cargo-cache-build-tests.sh
@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Failures under set -e in this suite die silently in CI otherwise;
+# name the dying command and line.
+trap 'echo "cargo-cache-build-tests.sh: exit $? at line $LINENO: $BASH_COMMAND" >&2' ERR
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 ROOT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
 WRAPPER="$ROOT_DIR/scripts/cargo-cache-build.sh"
diff --git a/scripts/tests/cargo-target-gc-tests.sh b/scripts/tests/cargo-target-gc-tests.sh
index 2491b70e2..e17c512f2 100755
--- a/scripts/tests/cargo-target-gc-tests.sh
+++ b/scripts/tests/cargo-target-gc-tests.sh
@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Failures under set -e in this suite die silently in CI otherwise;
+# name the dying command and line.
+trap 'echo "cargo-target-gc-tests.sh: exit $? at line $LINENO: $BASH_COMMAND" >&2' ERR
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 ROOT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
 GC="$ROOT_DIR/scripts/cargo-target-gc.sh"