Function potential_return_of_enclosing_body 

pub fn potential_return_of_enclosing_body(
    cx: &LateContext<'_>,
    expr: &Expr<'_>,
) -> bool

Checks if expr may be directly used as the return value of its enclosing body. The following cases are covered:

• expr as the last expression of the body, or of a block that can be used as the return value
• return expr
• then or else part of a if in return position
• arm body of a match in a return position
• break expr or break 'label expr if the loop or block being exited is used as a return value

Contrary to TyCtxt::hir_get_fn_id_for_return_block(), if expr is part of a larger expression, for example a field expression of a struct, it will not be considered as matching the condition and will return false.

Also, even if expr is assigned to a variable which is later returned, this function will still return false because expr is not used directly as the return value as it goes through the intermediate variable.