Write failing test for parametrized tests with unmarshable parameters
Write failing test for parametrized tests with unmarshable parameters

Related to #1030; committing directly to pytest repository to
get feedback from others on how to proceed.

RonnyPfannschmidt/pytest,rmfitzpatrick/pytest,JonathonSonesen/pytest,omarkohl/pytest,gabrielcnr/pytest,ropez/pytest,pytest-dev/pytest,jaraco/pytest,ropez/pytest,tgoodlet/pytest,vodik/pytest,davidszotten/pytest,tareqalayan/pytest,ionelmc/pytest,markshao/pytest,txomon/pytest,oleg-alexandrov/pytest,ionelmc/pytest,userzimmermann/pytest,hpk42/pytest,pfctdayelise/pytest,lukas-bednar/pytest,alfredodeza/pytest,tomviner/pytest,hpk42/pytest,nicoddemus/pytest,gabrielcnr/pytest,flub/pytest,Akasurde/pytest,etataurov/pytest,nicoddemus/pytest,vmalloc/dessert,eli-b/pytest,hackebrot/pytest,vodik/pytest,JonathonSonesen/pytest,tomviner/pytest,Bachmann1234/pytest,skylarjhdownes/pytest,The-Compiler/pytest,MengJueM/pytest,MengJueM/pytest,userzimmermann/pytest,Bachmann1234/pytest,lukas-bednar/pytest,malinoff/pytest,MichaelAquilina/pytest,oleg-alexandrov/pytest,ddboline/pytest,The-Compiler/pytest,omarkohl/pytest