We should test PDI with the latest version of the languages as supported by the latest version of the compilers we test

[jbigot]

Indeed, we should have some tests where we force the latest standard supported by the compilers. I think this could be done for example in half the runs using the latest environment. Any thought @benoitmartin88 ?

Originally posted by @jbigot in #542

[benoitmartin88]

Replied here: #542 (comment)