error[E0308]: mismatched types
  --> tests/compile-fail/with_closure_capture.rs:12:16
   |
12 |           with = |m| Ok(
   |                  ^ arguments to this function are incorrect
   |  ________________|
   | |
13 | |             String::from_meta(m)?.to_uppercase()
14 | |             + example1.1.as_ref().map(|s| s.as_str()).unwrap_or("")
15 | |         ),
   | |_________^ expected fn pointer, found closure
   |
   = note: expected fn pointer `for<'a> fn(&'a syn::Meta) -> Result<String, darling::Error>`
                 found closure `{closure@$DIR/tests/compile-fail/with_closure_capture.rs:12:16: 12:19}`
note: closures can only be coerced to `fn` types if they do not capture any variables
  --> tests/compile-fail/with_closure_capture.rs:14:15
   |
14 |             + example1.1.as_ref().map(|s| s.as_str()).unwrap_or("")
   |               ^^^^^^^^ `example1` captured here
help: the return type of this call is `{closure@$DIR/tests/compile-fail/with_closure_capture.rs:12:16: 12:19}` due to the type of the argument passed
  --> tests/compile-fail/with_closure_capture.rs:12:16
   |
12 |           with = |m| Ok(
   |  ________________^
13 | |             String::from_meta(m)?.to_uppercase()
14 | |             + example1.1.as_ref().map(|s| s.as_str()).unwrap_or("")
15 | |         ),
   | |_________- this argument influences the return type of `{{root}}`
note: function defined here
  --> $RUST/core/src/convert/mod.rs