syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"this.canonical_user_type_annotations.push(CanonicalUserTypeAnnotation"}]}
source_snippet:                         this.canonical_user_type_annotations.push(CanonicalUserTypeAnnotation {
context_before:                     let annotation_index =
context_after:                             span: user_ty_span,