syntax_data: {"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) fn push_user_type(&'a self, base: UserTypeAnnotationIndex) -> Self {
context_before: impl<'a> ProjectedUserTypesNode<'a> {
context_after:         // Pushing a base user type always causes the chain to become non-empty.