syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // a_ty's projections. First, we look through the list to see if
context_before:                 // Check that b_ty's projection is satisfied by exactly one of
context_after:                 // any match. If not, error. Then, if *more* than one matches, we