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ExtractVariables already walked nested interpolations in :- and :+
operands, but not in the :? / ? error message. So ${U:?${B}} and
${U?$B} only reported U, even though Substitute expands B when it
builds the missing-variable error.
The compose spec lists ${VARIABLE?$FOO} among nested interpolations.
Walk the required-error operand the same way as the default and
presence ones.
Fixes compose-spec#934
Signed-off-by: Kay van Dijk <git@vandijk.one>
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ExtractVariablesalready walked nested interpolations inside:-and:+values, but it skipped the:?/?error message. That meant${U:?${B}}and${U?$B}only reportedU, even thoughSubstitutedoes expandBwhen it builds the missing-variable error.The compose spec lists
${VARIABLE?$FOO}among nested interpolations, so I walk that operand the same way as the default and presence ones.Fixes #934