On https://gerrit.wikimedia.org/r/#/c/345390/1 it seems https://integration.wikimedia.org/ci/job/mwext-testextension-hhvm-composer-jessie/637/console and https://integration.wikimedia.org/ci/job/mwext-qunit-composer-jessie/6070/console are failing for the same issue
Symptomatic of a wider problem?
16:25:45 [90.0MB/20.46s] Updating dependencies (including require-dev) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/external-validation requires php (>= 5.5.0.0-dev) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency mediawiki/elastica requires php (>= 5.5.9.0-dev) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires php (>= 5.5.9.0-dev) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires data-values/common ([>= 0.3.0.0-dev < 0.4.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires data-values/geo ([>= 1.2.1.0-dev < 2.0.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires data-values/number ([>= 0.8.2.0-dev < 0.9.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires data-values/time ([>= 0.8.4.0-dev < 0.9.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires wikibase/data-model ([>= 7.0.0.0-dev < 8.0.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires wikibase/data-model-serialization ([>= 2.1.0.0-dev < 3.0.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/wikibase requires wikibase/data-model-services ([>= 3.7.0.0-dev < 4.0.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/quality requires php (>= 5.5.0.0-dev) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/quality requires wikibase/data-model ([[>= 4.0.0.0-dev < 5.0.0.0-dev] || [>= 5.0.0.0-dev < 6.0.0.0-dev] || [>= 6.0.0.0-dev < 7.0.0.0-dev] || [>= 7.0.0.0-dev < 8.0.0.0-dev]]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/quality requires wikibase/data-model-services ([>= 2.0.0.0-dev < 4.0.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency wikibase/quality requires serialization/serialization ([>= 3.2.1.0-dev < 4.0.0.0-dev]) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency mediawiki/cldr requires php (>= 5.5.9.0-dev) 16:25:46 [124.0MB/21.39s] [merge-plugin] Adding dependency mediawiki/cldr requires composer/installers (>= 1.0.1.0-dev) 16:25:50 [160.0MB/25.67s] Dependency resolution completed in 0.748 seconds 16:25:50 [160.0MB/25.71s] Your requirements could not be resolved to an installable set of packages. 16:25:50 [160.0MB/25.71s] 16:25:50 Problem 1 16:25:50 - The requested package wikibase/data-model ^7.0.0 is satisfiable by wikibase/data-model[7.0.0, 7.0.x-dev] but these conflict with your requirements or minimum-stability.