cat << 'EOF' > tmp/check.yaml
id: test
severity: High
message: "invalid validation"
match:
  resources:
    - group: ""
      version: v1
      resource: pods
validations:
  - expression: allContainers.all(variables.foo)
EOF
go run main.go scan --disable-builtin --checks /tmp/check.yaml 

E0318 17:03:19.731543   54820 scan.go:218] "msg"="failed to compile check test" "error"="validations[0].expression: type-check error: ERROR: <input>:1:18: undeclared reference to 'all' (in container '')\n | allContainers.all(variables.test)\n | .................^\nERROR: <input>:1:19: undeclared reference to 'variables' (in container '')\n | allContainers.all(variables.test)\n | ..................^" "check"="test"
I0318 17:03:19.731708   54820 scan.go:186] "msg"="scan finished with errors" 
SEVERITY   ID     CHECK                STATUS   FAILED   PASSED   SKIPPED 
High       test   invalid validation   ERROR    0        0        0         
exit status 2