syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // FIXME: `unicode_width` sometimes disagrees with terminals on how wide a `char` is. For now,
context_before: pub fn char_width(ch: char) -> usize {
context_after:     // just accept that sometimes the code line will be longer than desired.