fn add_function_impl(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
replacement_range: TextRange,
func: Function,
impl_def: Impl,
)fn add_function_impl(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
replacement_range: TextRange,
func: Function,
impl_def: Impl,
)