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rc_conf: " foo_VAR1=variable1\n " rc_d: foo template: var1: ${VAR1} var2: ${VAR2:?VAR2 is missing} error: VAR2 is missing --- rc_conf: " foo_VAR1=variable1\n " rc_d: foo template: ${VAR1}: VAR1 ${VAR2:?VAR2 is missing}: VAR2 error: VAR2 is missing