syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"Some(this.canonical_user_type_annotations.push(CanonicalUserTypeAnnotation"}]}
source_snippet:                     Some(this.canonical_user_type_annotations.push(CanonicalUserTypeAnnotation {
context_before:                 |user_ty| {
context_after:                         span,