--syntax-ckeck won't check syntax from variable-included files

Hello,

I noticed that --syntax-check won't check the syntax from included files
if the include statement is based on a variable.

I have an include statement such as:

$ head -n 3 roles/mongodb/tasks/main.yml

It cannot check syntax of dynamically included files, this would also affect include and include_roles. Since those would need actually executing the tasks.