Outer a = <: expr a :>, b = <: expr b :>
Including inner file without setting a or b, but c=99.
<: include included_scoped_vars.txt c=99 :>
Including inner file with scoped vars a=12, b=42, c=98.
<: include included_scoped_vars.txt a=12 b=42 c=98 :>
Outer a = <: expr a :>, b = <: expr b :>
