syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"this.new_source_scope(then_span,"}]}
source_snippet:                                 this.new_source_scope(then_span, LintLevel::Inherited);
context_before:                             let variable_scope =
context_after:                             this.source_scope = variable_scope;