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Description
The validator will not generate any errors for the following Dockerfile. We should check to make sure that such incomplete variables are warned about if possible.
FROM scratch
ARG aaa=${bbb$ docker build .
Sending build context to Docker daemon 1.695MB
Step 1/2 : FROM scratch
--->
Step 2/2 : ARG aaa=${bbb
failed to process "${bbb": missing ':' in substitution