syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let sm = SourceMap::new(FilePathMapping::empty());
context_before: fn span_to_snippet_and_lines_spanning_multiple_lines() {
context_after:     let inputtext = "aaaaa\nbbbbBB\nCCC\nDDDDDddddd\neee\n";