rust/tests/ui/generics/overlapping-errors-span-issue-123861.rs

fn mainIterator<_ = _> {}
//~^ ERROR expected identifier, found reserved identifier `_`
//~| ERROR   missing parameters for function definition
//~| ERROR   defaults for generic parameters are not allowed here [invalid_type_param_default]
//~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
//~| ERROR   the placeholder `_` is not allowed within types on item signatures for functions [E0121]

fn main() {}