Function validate_desc_map_block 

fn validate_desc_map_block(
    caller: &str,
    block: &Block,
    data: &Everything,
    sc: &mut ScopeContext,
    f: &impl Fn(&Token, &Everything, &mut ScopeContext),
)

Internal function to recurse over the complex description block logic.

caller is the name of the key that opened this block. block is the block or sub-block being validated. sc is the scope in which to evaluate any triggers found. f is the closure to run over any strings found.