syntax_data: {"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let prev_source = &prev_source[just_after_pat_plus_ws..];
context_before:                 let len = prev_source.len() - just_after_pat_plus_ws;
context_after:                 if accept_newlines || !prev_source.trim_start().contains('\n') {